fix: normalize line endings before parsing pyproject.toml

[MOHAMMED WASIM KHAN (wasim-builds)]

Summary

Fixes #25809

When pyproject.toml uses CRLF line endings (\r\n) on Windows and contains comments (e.g. # comment), @iarna/toml throws an error:
Control characters (codes < 0x1f and 0x7f) are not allowed in comments, use \u000d instead
because it encounters carriage return characters (\r) within comments. This causes tomlParse to fail with Failed to parse pyproject.toml error logs and prevent detection of pip-installable projects and optional dependencies.

Changes

• In src/client/pythonEnvironments/creation/provider/venvUtils.ts, normalize \r\n and \r line endings to \n in tomlParse before delegating to tomljs.parse.
• Added unit tests in src/test/pythonEnvironments/creation/provider/venvUtils.unit.test.ts verifying that isPipInstallableToml and pickPackagesToInstall parse pyproject.toml with CRLF line endings and comments without errors.

Verification

• npx tsc -p ./ succeeded with 0 errors.
• npx mocha --require out/test/unittests.js out/test/pythonEnvironments/creation/provider/venvUtils.unit.test.js --ui tdd (20 passed).

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