Enable more revive linter rules (#30608)

Noteable additions:

- `redefines-builtin-id` forbid variable names that shadow go builtins
- `empty-lines` remove unnecessary empty lines that `gofumpt` does not
remove for some reason
- `superfluous-else` eliminate more superfluous `else` branches

Rules are also sorted alphabetically and I cleaned up various parts of
`.golangci.yml`.

services/pull/pull.go

@@ -807,7 +807,6 @@ func GetSquashMergeCommitMessages(ctx context.Context, pr *issues_model.PullRequ
 			if err != nil {
 				log.Error("Unable to get commits between: %s %s Error: %v", pr.HeadBranch, pr.MergeBase, err)
 				return ""
-
 			}
 			if len(commits) == 0 {
 				break