Performance Improvements (5) (#6076)
### Description
The `AsyncModule` code generation in every ESM flags it as "needs
availability info" which causes code generation to be duplicated for
each entrypoints.
This improves it a little bit by checking is the module is an async
module before. It also fixes a bug where availability is not correct
reduced and only passes the availability root to async module
computation instead of the full availability info.
### Testing Instructions
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Closes WEB-1697
