feat(manager): support azure-pipelines (#7325)

...azure-pipelines/__fixtures__/azure-pipelines-invalid.yaml

...pipelines/__fixtures__/azure-pipelines-no-dependency.yaml

...manager/azure-pipelines/__fixtures__/azure-pipelines.yaml

...anager/azure-pipelines/__snapshots__/extract.spec.ts.snap

lib/manager/azure-pipelines/extract.spec.ts

lib/manager/azure-pipelines/extract.ts

lib/manager/azure-pipelines/index.ts

lib/manager/azure-pipelines/readme.md