feat: trust extensions

[alienvspredator]

What this PR does / why we need it:

Setup trust with an extensible OIDC flow.

Special notes for your reviewer:

The PR introduces breaking changes in the TrustMapping api.

Release note:

- Remove sessionmanager.oidcmapping.v1 package.
- Define sessionmanager.trustmapping.v1 package.
- Define trust.oidc.v1 and trust.oidc.flow.v1 packages.
- Update protovalidate to v1.2.0.

feat: trust mapping

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 21aacf94-4502-401e-a1e5-d7df9be1d208

📥 Commits

Reviewing files that changed from the base of the PR and between cbe1ae1 and a872a7e.

⛔ Files ignored due to path filters (9)

• proto/kms/api/cmk/sessionmanager/oidcmapping/v1/oidcmapping.pb.go is excluded by !**/*.pb.go
• proto/kms/api/cmk/sessionmanager/oidcmapping/v1/oidcmapping_grpc.pb.go is excluded by !**/*.pb.go
• proto/kms/api/cmk/sessionmanager/trustmapping/v1/trustmapping.pb.go is excluded by !**/*.pb.go
• proto/kms/api/cmk/sessionmanager/trustmapping/v1/trustmapping_grpc.pb.go is excluded by !**/*.pb.go
• proto/kms/api/cmk/trust/oidc/flow/v1/attribute.pb.go is excluded by !**/*.pb.go
• proto/kms/api/cmk/trust/oidc/flow/v1/flow.pb.go is excluded by !**/*.pb.go
• proto/kms/api/cmk/trust/oidc/v1/oidc.pb.go is excluded by !**/*.pb.go
• proto/kms/api/cmk/trust/v1/trust.pb.go is excluded by !**/*.pb.go
• protofetch.lock is excluded by !**/*.lock

📒 Files selected for processing (8)

• proto/kms/api/cmk/sessionmanager/oidcmapping/v1/oidcmapping.proto
• proto/kms/api/cmk/sessionmanager/trustmapping/v1/trustmapping.proto
• proto/kms/api/cmk/trust/oidc/flow/v1/attribute.proto
• proto/kms/api/cmk/trust/oidc/flow/v1/flow.proto
• proto/kms/api/cmk/trust/oidc/v1/oidc.proto
• proto/kms/api/cmk/trust/v1/trust.proto
• protofetch.toml
• vendor-proto/buf/validate/validate.proto

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[github-actions]

The latest Buf updates on your PR. Results from workflow Buf CI / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	❌ failed (1)	May 18, 2026, 9:38 AM