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/db/engine.go

@@ -236,7 +236,6 @@ func NamesToBean(names ...string) ([]any, error) {
 	// Need to map provided names to beans...
 	beanMap := make(map[string]any)
 	for _, bean := range tables {
-
 		beanMap[strings.ToLower(reflect.Indirect(reflect.ValueOf(bean)).Type().Name())] = bean
 		beanMap[strings.ToLower(x.TableName(bean))] = bean
 		beanMap[strings.ToLower(x.TableName(bean, true))] = bean