MMCTL: Add import delete cmd for removing the import files (#29764)

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>

server/channels/api4/api.go

@@ -126,6 +126,7 @@ type Routes struct {
 	Cloud *mux.Router // 'api/v4/cloud'
 
 	Imports *mux.Router // 'api/v4/imports'
+	Import  *mux.Router // 'api/v4/imports/{import_name:.+\\.zip}'
 
 	Exports *mux.Router // 'api/v4/exports'
 	Export  *mux.Router // 'api/v4/exports/{export_name:.+\\.zip}'
@@ -273,6 +274,7 @@ func Init(srv *app.Server) (*API, error) {
 	api.BaseRoutes.Cloud = api.BaseRoutes.APIRoot.PathPrefix("/cloud").Subrouter()
 
 	api.BaseRoutes.Imports = api.BaseRoutes.APIRoot.PathPrefix("/imports").Subrouter()
+	api.BaseRoutes.Import = api.BaseRoutes.Imports.PathPrefix("/{import_name:.+\\.zip}").Subrouter()
 	api.BaseRoutes.Exports = api.BaseRoutes.APIRoot.PathPrefix("/exports").Subrouter()
 	api.BaseRoutes.Export = api.BaseRoutes.Exports.PathPrefix("/{export_name:.+\\.zip}").Subrouter()
 
@@ -436,6 +438,7 @@ func InitLocal(srv *app.Server) *API {
 	api.BaseRoutes.Upload = api.BaseRoutes.Uploads.PathPrefix("/{upload_id:[A-Za-z0-9]+}").Subrouter()
 
 	api.BaseRoutes.Imports = api.BaseRoutes.APIRoot.PathPrefix("/imports").Subrouter()
+	api.BaseRoutes.Import = api.BaseRoutes.Imports.PathPrefix("/{import_name:.+\\.zip}").Subrouter()
 	api.BaseRoutes.Exports = api.BaseRoutes.APIRoot.PathPrefix("/exports").Subrouter()
 	api.BaseRoutes.Export = api.BaseRoutes.Exports.PathPrefix("/{export_name:.+\\.zip}").Subrouter()