[API] Migration: Change ServiceType String (#12672)

* use different structs for MigrateRepoOptions on UI and API

* Fix TokenAuth and rename UID to an understandable Name

* fix swagger doc

* simplify & mk redable

* R E F A C T O R:
migration has now internal 3 structs to store its options:
 * the Options for WebUI: modules/auth/repo_form.go
 * the Options for API: modules/structs/repo.go
 * the option struct with after validation for internal prossessing: modules/migrations/base/options.go

* Copyright Header

* Deprecate UID - add RepoOwner

* adopt repo.go -> migrate.go

* add comment about each struct purpose

* lint

integrations/api_repo_test.go

@@ -316,10 +316,10 @@ func TestAPIRepoMigrate(t *testing.T) {
 		user := models.AssertExistsAndLoadBean(t, &models.User{ID: testCase.ctxUserID}).(*models.User)
 		session := loginUser(t, user.Name)
 		token := getTokenForLoggedInUser(t, session)
-		req := NewRequestWithJSON(t, "POST", "/api/v1/repos/migrate?token="+token, &api.MigrateRepoOption{
-			CloneAddr: testCase.cloneURL,
-			UID:       int(testCase.userID),
-			RepoName:  testCase.repoName,
+		req := NewRequestWithJSON(t, "POST", "/api/v1/repos/migrate?token="+token, &api.MigrateRepoOptions{
+			CloneAddr:   testCase.cloneURL,
+			RepoOwnerID: testCase.userID,
+			RepoName:    testCase.repoName,
 		})
 		resp := MakeRequest(t, req, NoExpectedStatus)
 		if resp.Code == http.StatusUnprocessableEntity {
@@ -360,10 +360,10 @@ func testAPIRepoMigrateConflict(t *testing.T, u *url.URL) {
 		cloneURL := "https://github.com/go-gitea/test_repo.git"
 
 		req := NewRequestWithJSON(t, "POST", "/api/v1/repos/migrate?token="+httpContext.Token,
-			&api.MigrateRepoOption{
-				CloneAddr: cloneURL,
-				UID:       int(userID),
-				RepoName:  httpContext.Reponame,
+			&api.MigrateRepoOptions{
+				CloneAddr:   cloneURL,
+				RepoOwnerID: userID,
+				RepoName:    httpContext.Reponame,
 			})
 		resp := httpContext.Session.MakeRequest(t, req, http.StatusConflict)
 		respJSON := map[string]string{}