refactor(test): convert to ts (#4945)

lib/platform/common.ts

lib/workers/branch/get-updated.ts

lib/workers/branch/index.ts

lib/workers/branch/status-checks.ts

lib/workers/common.ts

lib/workers/pr/body/common.ts

lib/workers/pr/index.ts

test/util.ts

test/workers/branch/__snapshots__/commit.spec.ts.snap

test/workers/branch/__snapshots__/get-updated.spec.ts.snap

test/workers/branch/automerge.spec.ts

test/workers/branch/check-existing.spec.ts

test/workers/branch/commit.spec.ts

test/workers/branch/get-updated.spec.ts

test/workers/branch/index.spec.ts

...orkers/branch/lock-files/__snapshots__/index.spec.ts.snap

test/workers/branch/lock-files/index.spec.ts

test/workers/branch/lock-files/lerna.spec.ts

test/workers/branch/lock-files/npm.spec.ts

test/workers/branch/lock-files/pnpm.spec.ts