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

models/asymkey/gpg_key_object_verification.go

@@ -94,7 +94,6 @@ func ParseObjectWithSignature(ctx context.Context, c *GitObject) *ObjectVerifica
 					Reason:         "gpg.error.no_committer_account",
 				}
 			}
-
 		}
 	}