[Bug]: Python emitter overrides my _version.py file

[dargilco]

Describe the bug

I have to "git restore" the _version.py file after each re-emit of the SDK, because it keeps bringing the version that is defined in TypeSpec, instead of keeping what was already there. We have different SDKs (programming languages) that have different versions. So, the version in TypeSpec is meaningless. An emitter flag to not update _version.py would be helpful.

Reproduction

See above

Checklist

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[dargilco]

Tagging @iscai-msft for triage. Thanks!