Add per-tenant cardinality API endpoint#7384

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CharlieTLe wants to merge 9 commits intocortexproject:masterfrom

CharlieTLe:per-tenant-tsdb-status-api

Commits on Mar 30, 2026

Implement per-tenant cardinality API (Phase 1: head path)

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Implement per-tenant cardinality API (Phase 2: blocks path)

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Fix duplicate metrics registration in cardinality handler

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Register cardinality endpoint directly on external API server

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Add e2e integration test for cardinality API

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Simplify cardinality handler and fix review findings

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Add CHANGELOG entry for per-tenant cardinality API

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Fix lint issues: gofmt, faillint blocklisted import

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Fix flaky blocks path assertion in cardinality integration test

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