Remove Python 3.8 + Standardize on azsdk-pool on affected templates

[scbedd]

@LibbaLawrence this is the one that will merge. Wes didn't like the PYVERSION_X and I didn't really either :P

@msyyc can you please help me check this to ensure I don't break any of your use-cases?

[Copilot]

Copilot reviewed 22 out of 27 changed files in this pull request and generated no comments.

Files not reviewed (5)

• eng/pipelines/templates/stages/platform-matrix.json: Language not supported
• pyrightconfig.json: Language not supported
• sdk/communication/azure-communication-phonenumbers/phonenumbers-livetest-matrix.json: Language not supported
• sdk/cosmos/cosmos-emulator-matrix.json: Language not supported
• sdk/cosmos/live-platform-matrix.json: Language not supported

Comments suppressed due to low confidence (1)

eng/pipelines/templates/jobs/smoke.tests.yml:84

• The Windows matrix entries now reference $(LINUXPOOL) and $(LINUXVMIMAGE) which may be unintended for Windows jobs. Please confirm if a Windows-specific pool variable should be used instead.

              Pool: $(LINUXPOOL)

[azure-sdk]

API change check

API changes are not detected in this pull request.

[msyyc]

@scbedd I tested your changes locally and they work well. Since we also have PR #40396 to drop python 3.8 which seems have some conflicts with yours, please forgive me commit to your branch directly to resolve the conflict.

[msyyc]

Looks good to me.

[scbedd]

The failure in cosmos CI has nothing to do with this PR. It looks like a consistent specific test failing. Going to bypass that.

The single analyze failure from azure-core is also understood and caused by a separate pylint update. Going to merge this.

Thank you @msyyc for the merge + approval. I caught a couple remaining issues in archetype-python-release, but they were minor and I have since repaired them. Going to merge this thing before doing a final cleanup pass on all usage of the original pool names.