Rename tenant shard request param

[ephemeralsad]

Problem

"tenant_id" looks deprecated when we start parsing TenantShardId in #11026

Summary of changes

• Rename request param tenant_id to tenant_shard_id

[github-actions]

8481 tests run: 7899 passed, 0 failed, 582 skipped (full report)

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Flaky tests (6)

Postgres 17

• test_backward_compatibility: release-arm64-without-lfc
• test_sharding_split_failures[failure12]: release-arm64-without-lfc
• test_timeline_offloading[False]: release-arm64-without-lfc

Postgres 16

• test_sharding_split_failures[failure9]: release-arm64-with-lfc

Postgres 14

• test_ancestor_branch: release-x86-64-with-lfc
• test_replica_query_race: release-arm64-with-lfc

Code coverage* (full report)

• functions: 32.1% (9025 of 28104 functions)
• lines: 48.4% (80227 of 165759 lines)

* collected from Rust tests only

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_{The comment gets automatically updated with the latest test results
553e39c at 2025-06-13T20:04:41.165Z :recycle:}

[jcsp]

Sorry, I missed this one - feel free to bug me if I'm slow on reviews!