feat(agenda): support DIContext and allow manual job creation #7158

Job	Run time
lint (18.x)	6m 33s
test-integration (ubuntu-latest, 16.x)	2m 58s
test-core (18.x)	2m 18s
test-integration (ubuntu-latest, 18.x)	3m 20s
test-integration (macos-latest, 18.x)	6m 12s
test-integration (windows-latest, 18.x)	10m 15s
test-specs (18.x)	2m 19s
test-orm (18.x)	2m 28s
test-graphql (18.x)	2m 21s
test-platform (18.x)	2m 25s
test-formio (18.x)	2m 18s
test-security (18.x)	2m 17s
test-third-parties (18.x)	2m 29s
deploy-packages	1s
publish-docs	1s
	48m 15s

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