chore: improve test button selectors (#30153)

...teor/tests/e2e/federation/page-objects/account-profile.ts

apps/meteor/tests/e2e/federation/page-objects/admin.ts

.../federation/page-objects/fragments/admin-flextab-users.ts

...federation/page-objects/fragments/home-flextab-members.ts

...objects/fragments/home-flextab-notificationPreferences.ts

...2e/federation/page-objects/fragments/home-flextab-room.ts

...sts/e2e/federation/page-objects/fragments/home-flextab.ts

...sts/e2e/federation/page-objects/fragments/home-sidenav.ts

apps/meteor/tests/e2e/page-objects/account-profile.ts

apps/meteor/tests/e2e/page-objects/admin-email-inboxes.ts

...r/tests/e2e/page-objects/fragments/admin-flextab-users.ts

apps/meteor/tests/e2e/page-objects/fragments/home-content.ts

.../tests/e2e/page-objects/fragments/home-flextab-members.ts

...objects/fragments/home-flextab-notificationPreferences.ts

...eor/tests/e2e/page-objects/fragments/home-flextab-room.ts

apps/meteor/tests/e2e/page-objects/fragments/home-sidenav.ts

...2e/page-objects/fragments/omnichannel-close-chat-modal.ts

apps/meteor/tests/e2e/page-objects/omnichannel-agents.ts

.../meteor/tests/e2e/page-objects/omnichannel-departments.ts

apps/meteor/tests/e2e/page-objects/omnichannel-livechat.ts