Remove flakey mail test (#1309)

## Description

Test flakes because CI cleanup job goes through and deletes some folders the folder cache ends up looking for. Solve this by only selecting specific mail folders instead of all of them.

Will need to rely on other tests to check if fetching all mail folders works. As only some folders are checked for though, overall impact of removing this test should be minor as the more targeted test is still present

Mistakenly re-added by #1134 

## Type of change

<!--- Please check the type of change your PR introduces: --->
- [ ] 🌻 Feature
- [x] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Test
- [ ] 💻 CI/Deployment
- [ ] 🐹 Trivial/Minor

## Issue(s)

* closes #1222 

## Test Plan

<!-- How will this be tested prior to merging.-->
- [ ] 💪 Manual
- [x] ⚡ Unit test
- [ ] 💚 E2E

src/internal/connector/graph_connector_test.go

@@ -371,14 +371,6 @@ func (suite *GraphConnectorIntegrationSuite) TestMailFetch() {
 		scope       selectors.ExchangeScope
 		folderNames map[string]struct{}
 	}{
-		{
-			name:  "Mail Iterative Check",
-			scope: selectors.NewExchangeBackup().MailFolders([]string{userID}, selectors.Any())[0],
-			folderNames: map[string]struct{}{
-				exchange.DefaultMailFolder: {},
-				"Sent Items":               {},
-			},
-		},
 		{
 			name: "Folder Iterative Check Mail",
 			scope: selectors.NewExchangeBackup().MailFolders(