Refactor pipeline parsing and forge refreshing (#2527)

- refactor pipeline parsing
- do not parse the pipeline multiple times to perform filter checks, do
this once and perform checks on the result directly
    - code deduplication
- refactor forge token refreshing
    - move refreshing to a helper func to reduce code

---------

Co-authored-by: Anbraten <anton@ju60.de>

server/cron/cron.go

@@ -121,22 +121,10 @@ func CreatePipeline(ctx context.Context, store store.Store, f forge.Forge, cron
 		return nil, nil, err
 	}
 
-	// if the forge has a refresh token, the current access token
+	// If the forge has a refresh token, the current access token
 	// may be stale. Therefore, we should refresh prior to dispatching
 	// the pipeline.
-	if refresher, ok := f.(forge.Refresher); ok {
-		refreshed, err := refresher.Refresh(ctx, creator)
-		if err != nil {
-			log.Error().Err(err).Msgf("failed to refresh oauth2 token for creator: %s", creator.Login)
-		} else if refreshed {
-			if err := store.UpdateUser(creator); err != nil {
-				log.Error().Err(err).Msgf("error while updating creator: %s", creator.Login)
-				// move forward
-			} else {
-				log.Debug().Msgf("token refreshed for creator: %s", creator.Login)
-			}
-		}
-	}
+	forge.Refresh(ctx, f, store, creator)
 
 	commit, err := f.BranchHead(ctx, creator, repo, cron.Branch)
 	if err != nil {