Inclusion of rename organization api (#33303)

This adds an endpoint (`/orgs/{org}/rename`) to rename organizations.

I've modeled the endpoint using the rename user endpoint --
`/admin/users/{username}/rename` -- as base.

It is the 1st time I wrote a new API endpoint (I've tried to follow the
rename users endpoint code while writing it). So feel free to ping me if
there is something wrong or missing.

Resolves #32995

---------

Signed-off-by: Bruno Sofiato <bruno.sofiato@gmail.com>
Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
(cherry picked from commit 040c830dec5c727a56d16df62b1673bce6fca645)

Conflicts:
	routers/api/v1/admin/user.go
  ignore this unrelated change
	templates/swagger/v1_json.tmpl
  regenerate
	tests/integration/api_org_test.go
  port as a standalone test instead of refactoring the tests

routers/api/v1/org/org.go

@@ -320,6 +320,44 @@ func Get(ctx *context.APIContext) {
 	ctx.JSON(http.StatusOK, org)
 }
 
+func Rename(ctx *context.APIContext) {
+	// swagger:operation POST /orgs/{org}/rename organization renameOrg
+	// ---
+	// summary: Rename an organization
+	// produces:
+	// - application/json
+	// parameters:
+	// - name: org
+	//   in: path
+	//   description: existing org name
+	//   type: string
+	//   required: true
+	// - name: body
+	//   in: body
+	//   required: true
+	//   schema:
+	//     "$ref": "#/definitions/RenameOrgOption"
+	// responses:
+	//   "204":
+	//     "$ref": "#/responses/empty"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
+
+	form := web.GetForm(ctx).(*api.RenameOrgOption)
+	orgUser := ctx.Org.Organization.AsUser()
+	if err := user_service.RenameUser(ctx, orgUser, form.NewName); err != nil {
+		if user_model.IsErrUserAlreadyExist(err) || db.IsErrNameReserved(err) || db.IsErrNamePatternNotAllowed(err) || db.IsErrNameCharsNotAllowed(err) {
+			ctx.Error(http.StatusUnprocessableEntity, "RenameOrg", err)
+		} else {
+			ctx.ServerError("RenameOrg", err)
+		}
+		return
+	}
+	ctx.Status(http.StatusNoContent)
+}
+
 // Edit change an organization's information
 func Edit(ctx *context.APIContext) {
 	// swagger:operation PATCH /orgs/{org} organization orgEdit