[MM-29646] Add check for IsPaidTier, and don't send emails over limit for guest invites (#15958)

* Add check for ispaidtier to email invites

* Add same check for guest emails

* Update api4/team.go

Co-authored-by: Mario de Frutos Dieguez <mario@defrutos.org>

* Update api4/team.go

Co-authored-by: Mario de Frutos Dieguez <mario@defrutos.org>

* Check for an error and return if there is one

* Fix tests

* Remove test to move to enterprise repo

Co-authored-by: Mario de Frutos Dieguez <mario@defrutos.org>

api4/team_test.go

@@ -2726,69 +2726,6 @@ func TestImportTeam(t *testing.T) {
 	})
 }
 
-func TestInviteUsersToTeamWithUserLimit(t *testing.T) {
-	th := Setup(t).InitBasic()
-	defer th.TearDown()
-	email1 := th.GenerateTestEmail()
-	email2 := th.GenerateTestEmail()
-	email3 := th.GenerateTestEmail()
-	th.App.UpdateConfig(func(cfg *model.Config) {
-		*cfg.ServiceSettings.EnableEmailInvitations = true
-		*cfg.ExperimentalSettings.CloudUserLimit = 2
-	})
-
-	t.Run("System admin, invite when at limit should fail", func(t *testing.T) {
-		invitesWithErrors, resp := th.SystemAdminClient.InviteUsersToTeamGracefully(th.BasicTeam.Id, []string{email1, email2})
-		CheckNoError(t, resp)
-		require.Len(t, invitesWithErrors, 2)
-		require.NotNil(t, invitesWithErrors[0].Error)
-		assert.Equal(t, invitesWithErrors[0].Error.Message, "You've reached the free tier user limit")
-		require.NotNil(t, invitesWithErrors[1].Error)
-		assert.Equal(t, invitesWithErrors[1].Error.Message, "You've reached the free tier user limit")
-	})
-
-	t.Run("Regular user, invite when at limit should succeed", func(t *testing.T) {
-		invitesWithErrors, resp := th.Client.InviteUsersToTeamGracefully(th.BasicTeam.Id, []string{email3})
-		CheckNoError(t, resp)
-		require.Len(t, invitesWithErrors, 1)
-		assert.Nil(t, invitesWithErrors[0].Error)
-
-	})
-
-	th.App.UpdateConfig(func(cfg *model.Config) {
-		*cfg.ExperimentalSettings.CloudUserLimit = 5
-	})
-
-	t.Run("With one remaining user inviting more than one user as admin invites only one user", func(t *testing.T) {
-		invitesWithErrors, resp := th.SystemAdminClient.InviteUsersToTeamGracefully(th.BasicTeam.Id, []string{email1, email2})
-		CheckNoError(t, resp)
-		require.Len(t, invitesWithErrors, 2)
-		require.Nil(t, invitesWithErrors[0].Error)
-		require.NotNil(t, invitesWithErrors[1].Error)
-		assert.Equal(t, invitesWithErrors[1].Error.Message, "You've reached the free tier user limit")
-
-	})
-
-	t.Run("With one remaining user inviting more than one user as a regular user sends all invites", func(t *testing.T) {
-		invitesWithErrors, resp := th.Client.InviteUsersToTeamGracefully(th.BasicTeam.Id, []string{email1, email2})
-		CheckNoError(t, resp)
-		require.Len(t, invitesWithErrors, 2)
-		assert.Nil(t, invitesWithErrors[0].Error)
-		assert.Nil(t, invitesWithErrors[1].Error)
-
-	})
-
-	th.App.UpdateConfig(func(cfg *model.Config) {
-		*cfg.ExperimentalSettings.CloudUserLimit = 100
-	})
-	t.Run("Invited user count is well below limit", func(t *testing.T) {
-		invitesWithErrors, resp := th.SystemAdminClient.InviteUsersToTeamGracefully(th.BasicTeam.Id, []string{email1, email2})
-		CheckNoError(t, resp)
-		require.Len(t, invitesWithErrors, 2)
-		require.Nil(t, invitesWithErrors[0].Error)
-	})
-}
-
 func TestInviteUsersToTeam(t *testing.T) {
 	th := Setup(t).InitBasic()
 	defer th.TearDown()