feat(core/dashboard): include list of detected package files (#15418)

...ry/__fixtures__/master-issue_with_2_PR_closed_ignored.txt

...repository/__fixtures__/master-issue_with_2_PR_edited.txt

...itory/__fixtures__/master-issue_with_3_PR_in_approval.txt

...itory/__fixtures__/master-issue_with_3_PR_in_progress.txt

...orkers/repository/__fixtures__/master-issue_with_8_PR.txt

lib/workers/repository/__fixtures__/package-files.json

...epository/__snapshots__/dependency-dashboard.spec.ts.snap

lib/workers/repository/dependency-dashboard.spec.ts

lib/workers/repository/dependency-dashboard.ts

lib/workers/repository/finalise/index.ts

lib/workers/repository/package-files.ts

lib/workers/repository/process/fetch.ts