repl: allow recovery for wrapped eval

[codebytere]

Follow-up to #31943.

In the PR above, repl eval was altered to eagerly try and wrap code with parens, but this could in some cases cause failures for code which is only valid JavaScript in an unwrapped state.

This PR makes that logic more robust by ensuring that the wrapped code is parsed to be valid JS before evaluation continues, and proceeds unwrapped if it is found to be invalid.

cc @devsnek @BridgeAR

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• commit message follows commit guidelines

[BridgeAR]

Is this actually necessary? The code is first checked as wrapped code and in case that fails it is run unwrapped.

[codebytere]

Hmm looks like you're right - I was proceeding on the assumption it was based on the original issue but i think that was just my misreading! Closing :)