Add missing "source" enum options to GraphQL API in `CiPipelineCiSources` and source filters

The following discussion from !167489 (merged) should be addressed:

• @mrincon started a discussion: (+1 comment)

  @pedropombeiro I came across this extended sources list at: e0775471 which include some Enterprise Edition sources. Are those sources something we should consider in our CiPipelineCiSources ENUM values?