Use case-insensitive comparison for emails in permission check (#2417)

## Description

Tests were flaking due to inconsistent case in strings. Normalize case prior to comparing.

## Does this PR need a docs update or release note?

- [ ] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [x] ⛔ No 

## Type of change

- [ ] 🌻 Feature
- [x] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Test
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup

## Issue(s)

* closes #2416

## Test Plan

- [ ] 💪 Manual
- [x] ⚡ Unit test
- [ ] 💚 E2E

src/internal/connector/graph_connector_helper_test.go

@@ -698,7 +698,7 @@ func compareOneDriveItem(
 
 	// FIXME(meain): The permissions before and after might not be in the same order.
 	for i, p := range expectedMeta.Permissions {
-		assert.Equal(t, p.Email, itemMeta.Permissions[i].Email)
+		assert.Equal(t, strings.ToLower(p.Email), strings.ToLower(itemMeta.Permissions[i].Email))
 		assert.Equal(t, p.Roles, itemMeta.Permissions[i].Roles)
 		assert.Equal(t, p.Expiration, itemMeta.Permissions[i].Expiration)
 	}