feat: apply service.VALID_SITE_URL_SCHEMES to apply to repository and organization profiles (#12962)

Turns out this was a one-line fix for each affected field (change the binding from `ValidUrl` to `ValidSiteUrl`), but the tests are rather verbose. The tests are, however, each a simple flow of Create Thing > Try HTTP Website > Try Different Website (notice failure) > Try Different Website With New Config (notice success). I wrote this PR by adding failing tests first, then making the change, for each affected field.

Not sure if this should be "feat:" or "fix:" tbh. I figured "fix:" for this PR since IMO the expected behavior is for `VALID_SITE_URL_SCHEMES` to apply in each of these cases, not only for user profiles via the UI form. (Later changed to "feat:" at @limiting-factor's suggestion, based on the observation that this change extends documented behavior.)

This PR deals with the server-side validation only. #12991 covers client-side validation (deriving a `pattern` attribute from `VALID_SITE_URL_SCHEMES`, etc.)

Closes #5519

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/12962
Reviewed-by: limiting-factor <limiting-factor@noreply.codeberg.org>

services/forms/admin.go

@@ -39,7 +39,7 @@ type AdminEditUserForm struct {
 	FullName                string `binding:"MaxSize(100)"`
 	Email                   string `binding:"Required;EmailForAdmin;MaxSize(254)"`
 	Password                string `binding:"MaxSize(255)"`
-	Website                 string `binding:"ValidUrl;MaxSize(255)"`
+	Website                 string `binding:"ValidSiteUrl;MaxSize(255)"`
 	Location                string `binding:"MaxSize(50)"`
 	Language                string `binding:"MaxSize(5)"`
 	Pronouns                string `binding:"MaxSize(50)"`

services/forms/org.go

@@ -40,7 +40,7 @@ type UpdateOrgSettingForm struct {
 	FullName                  string `binding:"MaxSize(100)"`
 	Email                     string `binding:"MaxSize(255)"`
 	Description               string `binding:"MaxSize(255)"`
-	Website                   string `binding:"ValidUrl;MaxSize(255)"`
+	Website                   string `binding:"ValidSiteUrl;MaxSize(255)"`
 	Location                  string `binding:"MaxSize(50)"`
 	Visibility                structs.VisibleType
 	MaxRepoCreation           int

services/forms/repo_form.go

@@ -130,7 +130,7 @@ func ParseRemoteAddr(remoteAddr, authUsername, authPassword string) (string, err
 type RepoSettingForm struct {
 	RepoName               string `binding:"Required;AlphaDashDot;MaxSize(100)"`
 	Description            string `binding:"MaxSize(2048)"`
-	Website                string `binding:"ValidUrl;MaxSize(1024)"`
+	Website                string `binding:"ValidSiteUrl;MaxSize(1024)"`
 	FollowingRepos         string
 	Interval               string
 	MirrorAddress          string