fix: harden Python release artifacts

[BartoszBlizniak]

Summary

Prepare the Python release artifacts for conda-forge packaging required by cloudsmith-io/cloudsmith-cli#326.

• require Python 3.10 or newer and produce a Python 3-only wheel
• include the licence and exclude the generated test package from installation
• preserve release metadata and omit obsolete test configuration through supported Swagger Codegen inputs
• build clean PEP 517 artifacts and validate them with Twine
• test against the minimum supported Python version in CI

Validation

• clean Python client regeneration
• 690 tests passed on Python 3.10
• sdist and wheel passed package and metadata checks
• CircleCI configuration and release scripts validated

[Copilot]

Pull request overview

Hardens generated Python release artifacts for Python 3.10+, PEP 517, and conda-forge compatibility.

Changes:

• Adds Python 3.10 packaging metadata and Python 3-only wheels.
• Excludes generated tests and obsolete CI files.
• Builds and validates clean artifacts before publishing.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
README.md	Updates the wheel badge to py3.
.circleci/config.yml	Tests and deploys with Python 3.10.
bindings/python/.swagger-codegen-ignore	Omits obsolete generated test configuration.
bindings/python/build.sh	Supplies Python requirements and restores metadata.
bindings/python/deploy.sh	Uses PEP 517 and validates artifacts.
bindings/python/release/pyproject.toml	Defines the release build backend.
bindings/python/src/.travis.yml	Removes obsolete Travis configuration.
bindings/python/src/LICENSE	Adds the license to release sources.
bindings/python/src/README.md	Documents Python 3.10 support.
bindings/python/src/pyproject.toml	Enables PEP 517 builds.
bindings/python/src/setup.py	Adds release metadata and excludes tests.
bindings/python/src/test-requirements.txt	Removes obsolete Nose dependencies.
bindings/python/src/tox.ini	Runs unittest under Python 3.
bindings/python/templates/README.mustache	Preserves generated Python documentation.
bindings/python/templates/setup.mustache	Defines hardened package metadata.
bindings/python/templates/tox.mustache	Generates modern tox configuration.

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