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

services/doctor/packages_nuget.go

@@ -51,7 +51,6 @@ func PackagesNugetNuspecCheck(ctx context.Context, logger log.Logger, autofix bo
 		logger.Info("Found %d versions for package %s", len(pvs), pkg.Name)
 
 		for _, pv := range pvs {
-
 			pfs, err := packages.GetFilesByVersionID(ctx, pv.ID)
 			if err != nil {
 				logger.Error("Failed to get files for package version %s %s: %v", pkg.Name, pv.Version, err)