Remove all sagas

[framitdavid]

We should review the remaining sagas in app-development and get rid of them... Here is an overview of the current sagas available:

function* root(): SagaIterator {
  yield fork(watchHandleFetchServiceSaga);
  yield fork(watchHandleFetchServiceNameSaga);
  yield fork(watchHandleSaveServiceNameSaga);
  yield fork(watchHandleFetchInitialCommitSaga);
  yield fork(watchHandleFetchServiceConfigSaga);
  yield fork(watchHandleSaveServiceConfigSaga);
  yield fork(applicationMetadataSagas);
  yield fork(appDeploymentSagas);
  yield fork(userSagas);
}

export const sagaMiddleware = createSagaMiddleware();

export const run = () => sagaMiddleware.run(root);

[framitdavid]

Today, we also have code that creates an application metadata file if it doesn't exist (getApplicationMetadataSaga). We should completely remove this type of code. We cannot guarantee the accuracy of the recreated file; it is retrieved from the app-template. For instance, if you have a v3 app and delete the application metadata, a new application metadata will be created, based on a v4 app.

[mlqn]

Fixed by #13193
And the code that created a missing application metadata was also removed here #12534