Git migration UX (#12619)

* Initial work

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Implementation

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Fix gitlab and token cloning

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Imports and JS

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Fix test

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Linting

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Generate swagger

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Move mirror toggle and rename options

Signed-off-by: jolheiser <john.olheiser@gmail.com>

Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

templates/swagger/v1_json.tmpl

@@ -13446,6 +13446,10 @@
           "type": "string",
           "x-go-name": "AuthPassword"
         },
+        "auth_token": {
+          "type": "string",
+          "x-go-name": "AuthToken"
+        },
         "auth_username": {
           "type": "string",
           "x-go-name": "AuthUsername"
@@ -13490,6 +13494,11 @@
           "type": "string",
           "x-go-name": "RepoName"
         },
+        "service": {
+          "type": "integer",
+          "format": "int64",
+          "x-go-name": "Service"
+        },
         "uid": {
           "type": "integer",
           "format": "int64",