MM-8708 Remove api package (#8784)

* Remove api package

* Remove api dependency from cmd package

* Remove EnableAPIv3 setting

* Update web tests

* Add more websocket tests

* Move some ws and oauth tests to api4 package

* Move command tests into api4 package

* Test fixes

* Fix msg command test

* Add some app file tests

app/file.go

@@ -295,11 +295,6 @@ func (a *App) GeneratePublicLink(siteURL string, info *model.FileInfo) string {
 	return fmt.Sprintf("%s/files/%v/public?h=%s", siteURL, info.Id, hash)
 }
 
-func (a *App) GeneratePublicLinkV3(siteURL string, info *model.FileInfo) string {
-	hash := GeneratePublicLinkHash(info.Id, *a.Config().FileSettings.PublicLinkSalt)
-	return fmt.Sprintf("%s%s/public/files/%v/get?h=%s", siteURL, model.API_URL_SUFFIX_V3, info.Id, hash)
-}
-
 func GeneratePublicLinkHash(fileId, salt string) string {
 	hash := sha256.New()
 	hash.Write([]byte(salt))