[AP-2965] fix for python publisher and pull request template

[amofakhar]

Description of change

Context

https://transferwise.atlassian.net/browse/AP-2965

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[Copilot]

Pull request overview

Changes: Build and packaging (1), Meta (1)

Updates the GitHub Actions workflow used to publish the Python package to PyPI, and simplifies the repository pull request template.

Changes:

• Add a pypi GitHub Environment and explicit token permissions to the PyPI publish job.
• Simplify .github/pull_request_template.md to focus on a single “Context” section.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
.github/workflows/pythonpublish.yml	Adds environment + permissions configuration for the PyPI publish job.
.github/pull_request_template.md	Removes QA/risk/rollback sections, leaving a minimal context prompt.

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