docs: add pagerduty integration documentation page #6579

Job	Run time
Build docker image	5m 34s
config-e2e	1s
Agent unit tests	1m 11s
CLI unit tests	30s
API Server unit tests	2m 33s
WebUI unit tests	1m 58s
CLI smoke tests (local)	38s
CLI e2e tests (8, 0)	1m 15s
Test examples (collector)	42s
CLI smoke tests (docker)	43s
CLI e2e tests (8, 1)	1m 27s
WebUI End-to-end tests (1)	2m 33s
Test examples (tracetest-jaeger)	38s
CLI e2e tests (8, 2)	1m 26s
Test examples (tracetest-opensearch)	7m 19s
WebUI End-to-end tests (2)	2m 34s
CLI e2e tests (8, 3)	1m 19s
Test examples (tracetest-tempo)	38s
WebUI End-to-end tests (3)	2m 33s
Tracetesting API Server (InMemory)	3m 51s
CLI e2e tests (8, 4)	1m 25s
Test examples (tracetest-provisioning-env)	38s
WebUI End-to-end tests (4)	2m 34s
CLI e2e tests (8, 5)	2m 33s
WebUI End-to-end tests (5)	2m 30s
CLI e2e tests (8, 6)	1m 28s
WebUI End-to-end tests (6)	2m 33s
Tracetesting API Server (NATS)	3m 54s
CLI e2e tests (8, 7)	3m 22s
WebUI End-to-end tests (7)	3m 31s
WebUI End-to-end tests (8)	2m 33s
	1h 6m 24s

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