[server-pro] tests: make project invite tests more reliable (#23732)

* [web] wait for sending project invite notification, send email detached

Errors from sending the notification or email are still logged only.
Wait up-to ~one second for notification to be sent (API timeout is 1s).

* [server-pro] tests: wait for invite action to complete

GitOrigin-RevId: e6998e6134b5267c91b47785d616a46e9651b996

server-ce/test/create-and-compile-project.spec.ts

@@ -102,6 +102,7 @@ describe('Project creation and compilation', function () {
     cy.findByRole('dialog').within(() => {
       cy.get('input').type('collaborator@example.com,')
       cy.findByText('Invite').click({ force: true })
+      cy.findByText('Invite not yet accepted.')
     })
 
     cy.visit('/project')