remove explicit calls to pyenv

[cchristous]

What

This changes the Semaphore pipeline to no longer contain explicit calls to pyenv.

This approach will enable an upcoming change to Semaphore agents to replace pyenv usage with mise, which is an analogous tool that supports many different languages.

Checklist

• Contains customer facing changes? Including API/behavior changes
• Did you add sufficient unit test and/or integration test coverage for this PR?
  • If not, please explain why it is not required

References

JIRA:

Test & Review

Open questions / Follow-ups

[confluent-cla-assistant]

🎉 All Contributor License Agreements have been signed. Ready to merge.
_{Please push an empty commit if you would like to re-run the checks to verify CLA status for all contributors.}

[Copilot]

Pull Request Overview

Removes explicit pyenv commands from the Semaphore CI pipeline to prepare for an upcoming migration to mise.

• Eliminates manual lookup of Python versions and PATH exports across build steps
• Relies solely on the sem-version python command to set up the Python environment

[MSeal]

Applied a fix for tag builds, looks good now for merge now

[sonarqube-confluent]

Analysis Details

0 Issues

• 0 Bugs
• 0 Vulnerabilities
• 0 Code Smells

Coverage and Duplications

• No coverage information (66.00% Estimated after merge)
• No duplication information (5.20% Estimated after merge)

Project ID: confluent-kafka-python

View in SonarQube

[emasab]

Approving for @confluentinc/clients after @MSeal review