repl: allow recovery for wrapped eval #31990
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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), orvcbuild test
(Windows) passes