ci: migrate Ubuntu 22.04 runners to 26.04

[deodattap]

Summary

• Migrate GitHub Actions runners from Ubuntu 22.04 to Ubuntu 26.04.
• Update the affected CI and CMake install workflows.
• Keep existing Ubuntu 24.04 runners unchanged.

Fixes #4596

[linux-foundation-easycla]

• ❌ - login: @deodattap / name: Deodatta Pagar. The commit (6ad5aa8) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please visit our EasyCLA portal and chat with our support bot.

[esigo]

LGTM

[esigo]

• ❌ - login: @deodattap / name: Deodatta Pagar. The commit (6ad5aa8) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please visit our EasyCLA portal and chat with our support bot.

@deodattap thanks for your contribution, please sign the CLA.

[esigo]

please fix the failing CIs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.66%. Comparing base (754928d) to head (6ad5aa8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4651   +/-   ##
=======================================
  Coverage   86.66%   86.66%           
=======================================
  Files         525      525           
  Lines       20481    20481           
=======================================
  Hits        17748    17748           
  Misses       2733     2733           

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