.github/workflows: Migrate workflows to Blacksmith runners

[blacksmith-sh]

This PR has been automatically generated by a team member in your GitHub organization using Blacksmith's Migration Wizard. This PR changes the following:

1. Your selected workflows will now run on Blacksmith's 2x faster hardware (e.g., runs-on: blacksmith-4vcpu-ubuntu-2204). Learn more about the different instances available to choose from.
2. Your jobs running on Blacksmith will now have all official GitHub and popular third-party cache actions automatically interact with our 4x faster, colocated cache. Learn more about Blacksmith's actions cache.
3. Your GitHub Actions will now actually be observable. Learn more about Blacksmith's logging and other observability features.
4. Your Docker builds will now automatically share their Docker layer cache, resulting in up to 40x faster builds. Learn more about Blacksmith's Docker layer caching.

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[codspeed-hq]

Merging this PR will degrade performance by 23.24%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

❌ 1 regressed benchmark
✅ 42 untouched benchmarks
⏩ 2 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
❌	crc32 checksum for medium bundle payload	11.8 ms	15.4 ms	-23.24%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing blacksmith-migration-bb59c86 (30d8aa0) with main (bb59c86)}

Footnotes

1. 2 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[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

[blacksmith-sh]

Found 3 test failures on Blacksmith runners:

Failures

Test	View Logs
[chromium] › playwright/e2e/ observe-tabs.spec.ts:8:3 › Observe sections › keeps Observe subtabs reachable on deskto p and mobile	View Logs
Observe sections/keeps Observe subtabs reachable on desktop and mobile	View Logs
Observe sections › keeps Observe subtabs reachable on desktop and mobile (42.8s)::error file=playwright/e2e/observe-tabs.spec.ts,title=[chromium] › playwright/e2e/ observe-tabs.spec.ts › Observe sections › keeps Observe subtabs reachable on desktop an d mobile,line=48,col=24:: 1) [chromium] › playwright/e2e/ observe-tabs.spec.ts › Observe sections/ keeps Observe subtabs reachable on desktop and mobile %0A Error: expect(page).toHave URL(expected) failed%0A%0A Expected pattern: //app/com.demo.app/observe/ native$/%0A Received string: "http://localhost:5173/app/com.demo.app/observe/ native?start=2026-08-04T20%3A46%3A55.465Z&end=2026-08-04T21%3A46%3A55.465Z&sort_created _at=desc"%0A Timeout: 40000ms%0A%0A Call log:%0A - Expect "toHaveURL" with t imeout 40000ms%0A - unexpected value "http://localhost:5173/app/com.demo.app/ observe/plugins"%0A 82 × unexpected value "http://localhost:5173/app/ com.demo.app/observe/ native?start=2026-08-04T20%3A46%3A55.465Z&end=2026-08-04T21%3A46%3A55.465Z&sort_created _at=desc"%0A%0A%0A 46	%0A 47

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