feat: drop bucketid_objname and add version list test coverage

[TylerHillery]

What kind of change does this PR introduce?

Part of the two phase roll out in #1346 to drop the bucketid_objname and add tests

[coveralls]

Coverage Report for CI Build 33559482155

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No base build found for commit 59b8d06 on tyler/feat/object-versioning-wave-2.
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Coverage: 81.496%

Details

• Patch coverage: No coverable lines changed in this PR.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

Requires a base build to compare against. How to fix this →

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Coverage Stats

Relevant Lines:	13349
Covered Lines:	11323
Line Coverage:	84.82%
Relevant Branches:	8003
Covered Branches:	6078
Branch Coverage:	75.95%
Branches in Coverage %:	Yes
Coverage Strength:	656.28 hits per line

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💛 - Coveralls

[claude]

Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.

[Copilot]

Pull request overview

This PR advances the version-aware object listing rollout by removing the legacy bucketid_objname index and adding extensive test coverage around versioned listing behavior (v1 and v2), including pagination edge cases and filter interactions.

Changes:

• Adds v1 list tests covering noncurrentVersions/deleteMarkers filters and multi-version pagination/batch-boundary behaviors.
• Adds a comprehensive v2 versioning test suite covering filter matrices, ordering within keys, pagination correctness, delimiter behavior, and continuation-token constraints.
• Introduces DB migration 0069 and registers it to drop the storage.bucketid_objname index concurrently.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/test/object.test.ts	Adds v1 versioned listing tests for filters and pagination/batch-boundary behaviors.
src/test/object-list-v2.test.ts	Adds v2 versioning-focused integration tests and DB seeding helpers.
src/internal/database/migrations/types.ts	Registers the new migration identifier and version number.
migrations/tenant/0069-drop-bucketid-objname-index.sql	Drops the legacy index concurrently (non-transactional migration).

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