chore: add pagerduty migrator test + fix linting #2542

Job	Run time
Linting and tests / Lint entire project	1m 59s
Linting and tests / Lint, test, and build frontend	1m 31s
Linting and tests / Test technical documentation	18s
Linting and tests / Lint database migrations	1m 4s
Linting and tests / Ensure database migrations drop columns the correct way	7s
Linting and tests / Helm Chart Unit Tests	18s
Linting and tests / Backend Tests: MySQL + RabbitMQ (RBAC enabled: True)	4m 38s
Linting and tests / mypy	1m 29s
Linting and tests / Backend Tests: MySQL + RabbitMQ (RBAC enabled: False)	4m 24s
Linting and tests / Backend Tests: Plugin	38s
Linting and tests / Backend Tests: PostgreSQL + RabbitMQ (RBAC enabled: True)	4m 22s
Linting and tests / Backend Tests: SQLite + Redis (RBAC enabled: True)	3m 54s
Linting and tests / Backend Tests: PostgreSQL + RabbitMQ (RBAC enabled: False)	4m 32s
Linting and tests / Unit tests - Migrators	28s
Linting and tests / Backend Tests: SQLite + Redis (RBAC enabled: False)	3m 50s
Snyk security scan / Snyk security scan	1m 23s
Linting and tests / Standard e2e tests (10.3.0) / Grafana: 10.3.0	7m 51s
Linting and tests / Standard e2e tests (11.2.0) / Grafana: 11.2.0	7m 44s
Linting and tests / Standard e2e tests (latest) / Grafana: latest	7m 55s
	58m 25s

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