refactor: setBranchStatus Function (#4996) (#5112)

lib/platform/azure/index.ts

lib/platform/bitbucket-server/index.ts

lib/platform/bitbucket/index.ts

lib/platform/common.ts

lib/platform/github/index.ts

lib/platform/gitlab/index.ts

lib/workers/branch/index.ts

lib/workers/branch/status-checks.ts

lib/workers/repository/finalise/validate.ts

test/platform/azure/index.spec.ts

test/platform/bitbucket-server/index.spec.ts

test/platform/bitbucket/index.spec.ts

test/platform/github/index.spec.ts

test/platform/gitlab/index.spec.ts

test/workers/repository/finalise/validate.spec.ts