Don't use isolated builds when building an sdist for a pipeline package supplied in --setup_file option.

[tvalentyn]

Starting from Apache Beam 2.52.0, building a pipeline package provided in the --setup_file pipeline option happens inside an isolated build environment, which requires downloading setuptools >= 40.8.0 at pipeline submission time.

Using isolated builds requires internet connection, which might otherwise not be necessary and not available in some scenarios.

This PR will fix the issue staring from Beam 2.56.0. Affected users could work around the issue by either:

1. uninstalling 'build' dependency in the pipeline submission environment OR
2. installing their pipeline package in a custom container using the --sdk_container_image pipeline option or by building the package manually and passing it using the --extra_package option instead of using the --setup_file pipeline option.

[tvalentyn]

R: @damccorm

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control

[tvalentyn]

Will update CHANGES.md to call out a known issue in a separate PR.