chore(ci): upgrade GHA runner image to Ubuntu 26.04

[hainenber]

chore(ci): upgrade GHA runner image to Ubuntu 26.04

SUMMARY

Very much self-titled. Ubuntu 26.04 trims off quite a lot of installations so in theory, this should help with job init time

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

Green CI as acceptance criterion

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 65.18%. Comparing base (277c814) to head (c77e517).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #42191   +/-   ##
=======================================
  Coverage   65.18%   65.18%           
=======================================
  Files        2768     2768           
  Lines      156099   156099           
  Branches    35727    35727           
=======================================
+ Hits       101749   101750    +1     
+ Misses      52385    52384    -1     
  Partials     1965     1965           

Flag	Coverage Δ
hive	38.61% <ø> (ø)
javascript	70.81% <ø> (+<0.01%)	⬆️
mysql	57.86% <ø> (ø)
postgres	57.92% <ø> (ø)
presto	40.55% <ø> (ø)
python	59.32% <ø> (ø)
sqlite	57.54% <ø> (ø)
unit	100.00% <ø> (ø)

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[rusackas]

Nice cleanup and CI's green, but check-python-deps.yml, the python-dependency-liccheck job, and both playwright-tests / playwright-tests-experimental are still on ubuntu-22.04 while everything else jumped to 26.04. Is that intentional (like the flaky-on-24.04 comment on cypress-matrix) or just missed? Leaving the two heaviest test jobs on the old image seems to undercut the job-init speedup this PR is going for.

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[rusackas]

Thanks for bumping the remaining jobs to 26.04, @hainenber! LGTM.

One nit: the comment above cypress-matrix in superset-e2e.yml about flaking on 24.04 is stale now that it jumped straight to 26.04, might want to update or drop it.