test: improve test readability with expect-more-jest (#12329)

jest.config.ts

lib/config/massage.spec.ts

lib/config/migration.spec.ts

lib/config/presets/index.spec.ts

lib/config/validation.spec.ts

lib/datasource/github-releases/index.spec.ts

lib/datasource/index.spec.ts

lib/datasource/npm/index.spec.ts

lib/datasource/npm/npmrc.spec.ts

lib/datasource/pypi/index.spec.ts

lib/logger/pretty-stdout.spec.ts

lib/manager/bundler/extract.spec.ts

lib/manager/bundler/host-rules.spec.ts

lib/manager/dockerfile/extract.spec.ts

lib/manager/gitlabci/extract.spec.ts

lib/manager/gradle-wrapper/artifacts-real.spec.ts

lib/manager/gradle-wrapper/artifacts.spec.ts

lib/manager/gradle/deep/index.spec.ts

lib/manager/gradle/shallow/utils.spec.ts

lib/manager/index.spec.ts