ci(triage): fire on PR comments + add is_pr/pr context (port of adcp#3316) #734

Job	Run time
Validate schemas are up-to-date	3m 44s
Downstream import smoke (representative consumer symbols)	27s
PgReplayStore tests (Postgres 16)	1m 2s
Validate conventional commit format	7s
Test Python 3.11	2m 32s
Test Python 3.13	2m 55s
Test Python 3.12	3m 6s
Test Python 3.10	3m 1s
	16m 54s

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