Reduce test to just a single site to avoid failure (#5274)

#### 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
- [x] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup

#### Test Plan

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

src/pkg/services/m365/sites_test.go

@@ -76,20 +76,11 @@ func (suite *siteIntegrationSuite) TestSites_GetByID() {
 	ctx, flush := tester.NewContext(t)
 	defer flush()
 
-	sites, err := suite.cli.Sites(ctx, fault.New(true))
-	assert.NoError(t, err, clues.ToCore(err))
-	assert.NotEmpty(t, sites)
-
-	for _, s := range sites {
-		suite.Run("site_"+s.ID, func() {
-			t := suite.T()
-			site, err := suite.cli.SiteByID(ctx, s.ID)
+	site, err := suite.cli.SiteByID(ctx, suite.m365.Site.ID)
 	require.NoError(t, err, clues.ToCore(err))
 	assert.NotEmpty(t, site.WebURL)
 	assert.NotEmpty(t, site.ID)
 	assert.NotEmpty(t, site.OwnerType)
-		})
-	}
 }
 
 // ---------------------------------------------------------------------------