containers: users can set multiple tiers for constraints

[nikitassharma]

Fixes CC-6151

Users can now specify constraints.tiers for their container applications. tier will be deprecated in favor of tiers.
If left unset, we will default to tiers: [1, 2]. If both tier and tiers are set, only the value for tiers will be respected.

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• Tests
  • Tests included/updated
  • Tests not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: not a documented feature

[changeset-bot]

🦋 Changeset detected

Latest commit: d87124f

The changes in this PR will be included in the next version bump.

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[claude]

Claude finished @nikitassharma's task —— View job

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Changeset Review

✅ All changesets look good

The changeset .changeset/wide-suns-brush.md is properly formatted:

• Version Type: ✅ Correct patch for all affected packages (adding tiers array while deprecating tier)
• Changelog Quality: ✅ Clear description of the new feature with usage details and default behavior
• Markdown Headers: ✅ No problematic h1/h2/h3 headers
• Package Coverage: ✅ All affected packages listed (@cloudflare/containers-shared, @cloudflare/workers-utils, wrangler)

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commit: d87124f