Description

This removes the use of the analysis server's --enable-experiment flag. The flag as been removed upstream, and passing it in will likely fail.

The flag had only been intended for dev time uses, like testing (users should configure analysis for language experiments via the analysis_options.yaml file).

Related Issues

• none

Tests

I added the following tests:

• I updated the existing tests

Checklist

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• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I signed the CLA.
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• I read the Tree Hygiene wiki page, which explains my responsibilities.
• I updated/added relevant documentation (doc comments with ///).
• All existing and new tests are passing.
• The analyzer (flutter analyze --flutter-repo) does not report any problems on my PR.
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Breaking Change

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• Yes, this is a breaking change. If not, delete the remainder of this section.
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