feat(trino): capture query usage analytics

[EDsCODE]

Summary

• capture terminal Trino query resource usage in existing PostHog query lifecycle events
• poll from the janitor leader with in-process query-ID deduplication and no SQL capture
• document Trino event fields and best-effort retention semantics

Testing

• go test -count=1 -tags kubernetes ./controlplane
• just lint (fails because unrelated untracked Iceberg integration tests reference a missing package)

[github-actions]

Test Impact Plan

Deterministic summary of how this PR changes tests, CI runners, and coverage-risk signals.

Summary

Area	Added	Changed	Deleted
Test files	1	0	0
E2E/journey files	0	0	0
Workflow files	0	0	0

Signals

• Test cases: +1 / -0
• Assertions: +8 / -0
• Skips or known failures added: 0
• Workflow continue-on-error added: 0
• Workflow path filters added: 0
• Test commands removed from justfile: 0
• E2E/journey retry lines added: 0

Coverage risk: neutral or increased

No coverage-reduction warnings detected.