fix Google Workspace connection probes

[erichanwang]

fixes #1694

changes:

• make Gmail check_connection call users.getProfile(me) before reporting ok
• make Drive check_connection call about.get(fields=user) before reporting ok
• add probe-failure regressions for Gmail and Drive

notes:

• Calendar already had a live probe. Docs and Sheets do not have a harmless no-id metadata read endpoint, so this keeps them unchanged instead of doing a fake probe.

verification:

• git diff --check
• PYTHONPATH=nodes/src:nodes/test:packages/server/engine-lib/rocketlib-python/lib /home/ericwang/Projects/upstream-contributions/rocketride-issue1638/.venv/bin/python -m pytest nodes/test/tool_google_workspace/gmail/test_gmail.py nodes/test/tool_google_workspace/drive/test_drive.py -q -> 172 passed
• pre-commit hook: gitleaks, ruff check, ruff format --check

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