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`.

(cherry picked from commit 74f0c84fa4245a20ce6fb87dac1faf2aeeded2a2)

Conflicts:
	.golangci.yml
	apply the linter recommendations to Forgejo code as well

tests/integration/pull_status_test.go

@@ -71,7 +71,6 @@ func TestPullCreate_CommitStatus(t *testing.T) {
 
 		// Update commit status, and check if icon is updated as well
 		for _, status := range statusList {
-
 			// Call API to add status for commit
 			t.Run("CreateStatus", doAPICreateCommitStatus(testCtx, commitID, api.CreateStatusOption{
 				State:       status,