Add confd integration tests for BGPFilter

[song-jiang]

Summary

• Add confd compiled template test fixtures for BGPFilter covering: AS path + priority,
  communities + operations, kubevirt live migration, large communities, and peer type scenarios
• Address review markups from PR Enhance BGPFilter API with new match criteria and route operations #12002: simplify BGPFilterBIRDFuncs doc comment,
  inline emitFilterRules, and deduplicate import/export logic with a direction loop

Release note:

TBD

[Copilot]

Pull request overview

Adds new confd test-suite coverage for additional BGPFilter match/operation combinations (communities, large communities, AS-path, priority, PeerType) and a KubeVirt live migration scenario, along with the corresponding expected compiled BIRD configs. Also refactors BGP filter BIRD function generation to reduce repeated import/export logic.

Changes:

• Add new test_bgp_filters sub-tests covering communities+operations, peerType, AS path+priority, large communities, and a KubeVirt live-migration scenario.
• Add expected compiled template outputs for the new bgpfilter scenarios.
• Refactor BGPFilterBIRDFuncs generation logic to unify import/export processing and inline rule emission.

Reviewed changes

Copilot reviewed 32 out of 32 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
confd/tests/test_suite_common.sh	Adds new bgpfilter-related test cases and wires them into the existing test_bgp_filters suite.
confd/pkg/resource/template/template_funcs.go	Refactors BGPFilter BIRD function generation to reduce duplication and centralize rule emission logic.
confd/tests/compiled_templates/bgpfilter/peer_type/bird.cfg	Adds expected BIRD v4 output for peerType rules test.
confd/tests/compiled_templates/bgpfilter/peer_type/bird6.cfg	Adds expected BIRD v6 output for peerType rules test.
confd/tests/compiled_templates/bgpfilter/peer_type/bird_aggr.cfg	Adds expected aggregation config for peerType scenario (v4).
confd/tests/compiled_templates/bgpfilter/peer_type/bird6_aggr.cfg	Adds expected aggregation config for peerType scenario (v6).
confd/tests/compiled_templates/bgpfilter/peer_type/bird_ipam.cfg	Adds expected IPAM config for peerType scenario (v4).
confd/tests/compiled_templates/bgpfilter/peer_type/bird6_ipam.cfg	Adds expected IPAM config for peerType scenario (v6).
confd/tests/compiled_templates/bgpfilter/large_community/bird.cfg	Adds expected BIRD v4 output for large-community matching/ops.
confd/tests/compiled_templates/bgpfilter/large_community/bird6.cfg	Adds expected BIRD v6 output for large-community matching/ops.
confd/tests/compiled_templates/bgpfilter/large_community/bird_aggr.cfg	Adds expected aggregation config for large-community scenario (v4).
confd/tests/compiled_templates/bgpfilter/large_community/bird6_aggr.cfg	Adds expected aggregation config for large-community scenario (v6).
confd/tests/compiled_templates/bgpfilter/large_community/bird_ipam.cfg	Adds expected IPAM config for large-community scenario (v4).
confd/tests/compiled_templates/bgpfilter/large_community/bird6_ipam.cfg	Adds expected IPAM config for large-community scenario (v6).
confd/tests/compiled_templates/bgpfilter/communities_and_operations/bird.cfg	Adds expected BIRD v4 output for standard communities + operations.
confd/tests/compiled_templates/bgpfilter/communities_and_operations/bird6.cfg	Adds expected BIRD v6 output for standard communities + operations.
confd/tests/compiled_templates/bgpfilter/communities_and_operations/bird_aggr.cfg	Adds expected aggregation config for communities+ops scenario (v4).
confd/tests/compiled_templates/bgpfilter/communities_and_operations/bird6_aggr.cfg	Adds expected aggregation config for communities+ops scenario (v6).
confd/tests/compiled_templates/bgpfilter/communities_and_operations/bird_ipam.cfg	Adds expected IPAM config for communities+ops scenario (v4).
confd/tests/compiled_templates/bgpfilter/communities_and_operations/bird6_ipam.cfg	Adds expected IPAM config for communities+ops scenario (v6).
confd/tests/compiled_templates/bgpfilter/as_path_and_priority/bird.cfg	Adds expected BIRD v4 output for AS-path prefix + priority match/ops.
confd/tests/compiled_templates/bgpfilter/as_path_and_priority/bird6.cfg	Adds expected BIRD v6 output for AS-path prefix + priority match/ops.
confd/tests/compiled_templates/bgpfilter/as_path_and_priority/bird_aggr.cfg	Adds expected aggregation config for AS-path+priority scenario (v4).
confd/tests/compiled_templates/bgpfilter/as_path_and_priority/bird6_aggr.cfg	Adds expected aggregation config for AS-path+priority scenario (v6).
confd/tests/compiled_templates/bgpfilter/as_path_and_priority/bird_ipam.cfg	Adds expected IPAM config for AS-path+priority scenario (v4).
confd/tests/compiled_templates/bgpfilter/as_path_and_priority/bird6_ipam.cfg	Adds expected IPAM config for AS-path+priority scenario (v6).
confd/tests/compiled_templates/bgpfilter/kubevirt_live_migration/bird.cfg	Adds expected BIRD v4 output for KubeVirt live-migration bgpfilter behavior.
confd/tests/compiled_templates/bgpfilter/kubevirt_live_migration/bird6.cfg	Adds expected BIRD v6 output for KubeVirt live-migration bgpfilter behavior.
confd/tests/compiled_templates/bgpfilter/kubevirt_live_migration/bird_aggr.cfg	Adds expected aggregation config for KubeVirt live-migration scenario (v4).
confd/tests/compiled_templates/bgpfilter/kubevirt_live_migration/bird6_aggr.cfg	Adds expected aggregation config for KubeVirt live-migration scenario (v6).
confd/tests/compiled_templates/bgpfilter/kubevirt_live_migration/bird_ipam.cfg	Adds expected IPAM config for KubeVirt live-migration scenario (v4).
confd/tests/compiled_templates/bgpfilter/kubevirt_live_migration/bird6_ipam.cfg	Adds expected IPAM config for KubeVirt live-migration scenario (v6).

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