Replaces url.URL.ResolveReference() with custom resolveURL() method
that properly handles base URLs containing path prefixes (e.g.,
https://proxy.example.com/buildkite/). The standard ResolveReference
behaves differently when resolving relative vs absolute URLs, dropping
the path prefix in one case and not the other, which leads to API
calls to incorrect endpoints.

Changes:
- Add Client.resolveURL() method to handle relative/absolute urls
  w/ bases that have path prefixes
- Update Client.NewRequest() to use new URL resolution

Fixes issue where proxy/gateway deployments with path prefixes
would lose the prefix during URL resolution, resulting in 404s.

…lution

Fix URL resolution to preserve base URL path prefixes

fix: update cluster maintainers to match REST api for create and list

Signed-off-by: Ben McNicholl <[email protected]>

Signed-off-by: Ben McNicholl <[email protected]>

release: changelog for v4.9.1