feat(loadtesting): advertise tag filter on run-list endpoints

[sourabhd-cbu]

Adds a tag query param (and a one-line guidance note) to the three run-list capabilities so the registry advertises run-tag filtering:

• GET /loadTests/{testId}/runs (listLoadTestRuns)
• GET /projects/{projectId}/runs (listProjectLoadTestRuns)
• GET /loadTests/runs/active (listActiveLoadTestRuns)

Without this, bind rejects ?tag= as an unknown query even though the backend supports it — so the filter is unreachable through the MCP. Response-side tags on run objects needs no declaration (fields pass through); only the query param must be declared.

Pairs with the load-testing-backend read-path change that implements the filter (getRunDisplayTags surfacing + findJobIdsByLabels push-down). Follows the merged run-tag write path (#402, runId on updateLoadTest).

[coderabbitai]

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