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/migrations/v1_11/v111.go

@@ -263,7 +263,6 @@ func AddBranchProtectionCanPushAndEnableWhitelist(x *xorm.Engine) error {
 		for _, u := range units {
 			var found bool
 			for _, team := range teams {
-
 				var teamU []*TeamUnit
 				var unitEnabled bool
 				err = sess.Where("team_id = ?", team.ID).Find(&teamU)
@@ -332,7 +331,6 @@ func AddBranchProtectionCanPushAndEnableWhitelist(x *xorm.Engine) error {
 		}
 
 		if !protectedBranch.EnableApprovalsWhitelist {
-
 			perm, err := getUserRepoPermission(sess, baseRepo, reviewer)
 			if err != nil {
 				return false, err