feat(ci): broaden usage of fast-startup ubuntu-slim runner

[hainenber]

feat(ci): broaden usage of fast-startup ubuntu-slim runner

SUMMARY

As heavy and highly usedubuntu-26.04 might not be readily available in the public pool, we should switch to ubuntu-slim for lightweight CI workloads

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

Green CI for acceptance threshold

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[bito-code-review]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.90%. Comparing base (1bde62f) to head (7f6db9b).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #43477      +/-   ##
==========================================
- Coverage   78.90%   78.90%   -0.01%     
==========================================
  Files        2878     2878              
  Lines      165031   165031              
  Branches    38135    38135              
==========================================
- Hits       130218   130216       -2     
- Misses      32363    32365       +2     
  Partials     2450     2450              

Flag	Coverage Δ
hive	38.05% <ø> (ø)
mysql	57.80% <ø> (ø)
postgres	57.83% <ø> (-0.01%)	⬇️
presto	39.97% <ø> (ø)
python	83.57% <ø> (-0.01%)	⬇️
sqlite	57.53% <ø> (ø)
unit	73.61% <ø> (-0.01%)	⬇️

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[rusackas]

One thing before I approve, though. validate-all-ghas is actually failing on ubuntu-slim, not flaky: zizmor pulls a Docker image and the runner has no daemon running (failed to connect to the docker API at unix:///var/run/docker.sock). Might be worth keeping that job on a full runner unless ubuntu-slim can run Docker some other way. The rest of the broadened jobs look fine.