feat: add PyPI trusted publishing instructions

[danielkov]

Summary

Adds instructions for configuring PyPI trusted publishing when users run speakeasy configure publishing with a Python target that has useTrustedPublishing: true configured.

Changes

• Add PyPITrustedPublishingConfig struct
• Add getPyPITrustedPublishingInstructions() function that generates user-facing instructions
• Update configurePublishing() to detect PyPI trusted publishing configs and display setup instructions
• Update sdk-gen-config dependency to v1.47.1 (includes UseTrustedPublishing field)

Instructions Output

When a user has configured trusted publishing, they'll see:

• Configure trusted publishing for your PyPI package 'my-package':
    ◦ Navigate to https://pypi.org/manage/project/my-package/settings/publishing/
    ◦ Add a new 'trusted publisher' with the following configuration:
        - Owner: my-org
        - Repository name: my-repo
        - Workflow name: sdk_publish.yaml
        - Environment name: <Leave Blank>
• Navigate to https://github.com/my-org/my-repo/actions to regenerate and publish
• Your package will be published with attestations. Verify at https://pypi.org/project/my-package/#files

Related PRs

• sdk-gen-config: feat: add PyPI trusted publishing support sdk-gen-config#115 (merged)
• sdk-generation-action: feat: add PyPI trusted publishing support to workflows sdk-generation-action#286 (merged)

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