feat!: replace `dockerImagePrefix` with `dockerSidecarImage` (#22708)

docs/usage/self-hosted-configuration.md

lib/config/global.ts

lib/config/options/index.ts

lib/config/types.ts

lib/modules/manager/bundler/artifacts.spec.ts

lib/modules/manager/cargo/artifacts.spec.ts

...es/manager/cocoapods/__snapshots__/artifacts.spec.ts.snap

lib/modules/manager/cocoapods/artifacts.spec.ts

lib/modules/manager/composer/artifacts.spec.ts

lib/modules/manager/gomod/artifacts.spec.ts

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

lib/modules/manager/gradle/artifacts.spec.ts

lib/modules/manager/helmfile/artifacts.spec.ts

...dules/manager/helmv3/__snapshots__/artifacts.spec.ts.snap

lib/modules/manager/helmv3/artifacts.spec.ts

lib/modules/manager/maven-wrapper/artifacts.spec.ts

lib/modules/manager/mix/__snapshots__/artifacts.spec.ts.snap

lib/modules/manager/mix/artifacts.spec.ts

lib/modules/manager/nix/artifacts.spec.ts

lib/modules/manager/npm/post-update/lerna.spec.ts