fix: Replace misleading queue message with accurate VM provisioning info

[cfsmp3]

Summary

• Replaces the inaccurate "X tests queued before this one" message with "Your test VM is being provisioned"
• Shows actual average completion time for the platform instead of fake queue-based estimates
• Removes ~30 lines of complex queue calculation code that was producing meaningless numbers
• Cleans up unused imports (datetime, func, label, GcpInstance)

Problem

The old message claimed:

"This test is still queued. There are X tests queued before this one. Based on the average runtime, this test will be finished in Y hours Z minutes."

This was completely inaccurate because:

1. Tests run in parallel, not sequentially
2. Each test gets its own GCP VM immediately
3. There is no actual queue - all pending tests start at the next cron cycle
4. The "queue position" had no effect on when a test would start

New Message

"Your test VM is being provisioned. Tests on [platform] typically complete in about X minutes."

This accurately reflects what's happening and gives users a realistic expectation.

Test plan

• View a test page before the test has started
• Verify the new message displays correctly
• Verify the average time is shown (if available in GeneralData)

🤖 Generated with Claude Code

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud