fix: do not crash with comment before method in store

[liamdebeasi]

Description

https://builder-io.atlassian.net/browse/ENG-7332

This PR fixes an issue where comments before a method in state would cause Mitosis to crash.

Given:

useStore({
  foo: true, // comment
  bar() {}
})

The comment would get pushed to its own line and become part of the bar node:

// comment
bar() {}

The expression handling fallback would then try to do something like this:

let _ = // comment
bar() {}

which is not a valid expression and would crash.

My PR fixes the issue by ensuring that the only the method code is used and any auxiliary data such as comments are removed from parsing.

Make sure to follow the PR preparation steps in CONTRIBUTING.md before submitting your PR:

• format the codebase: from the root, run yarn fmt:prettier.
• update all snapshots (in core & CLI): from the root, run yarn test:update
• add Changeset entry: from the root, run yarn g:changeset and follow the CLI instructions. Alternatively, use the Changeset Github Bot to create the file.

[changeset-bot]

🦋 Changeset detected

Latest commit: cf7eadd

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@builder.io/mitosis	Patch
@builder.io/mitosis-cli	Patch

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