progress: address race conditions in render/stop/trackers; fixes 399

[jedib0t]

Fixes race conditions in the progress package that were caught by the race detector.

The main issues were concurrent access to the output writer and tracker fields without proper synchronization. I've added mutex protection for the output writer and created accessor methods for tracker fields that handle the locking internally. Also fixed a missing mutex protection for the render context cancel call.

I also realized that make test-race was only running the progress demo, so I updated it to test all packages to catch these issues earlier.

All tests pass with the race detector enabled.

Fixes #399

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
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

[coveralls]

Pull Request Test Coverage Report for Build 20462348615

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Details

• 54 of 54 (100.0%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 20360201120:	0.0%
Covered Lines:	4839
Relevant Lines:	4839

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💛 - Coveralls