fix memory profiling race condition

[vzaidman]

Summary

When a memory heap snapshot is created, it is being retrieved before it's parsing is complete.

Test plan

Slow down parseInput by adding:

    await new Promise(resolve => setTimeout(resolve, 3000));

As the first line of that function to ensure the race condition always resolves with a crash.

Before:

before2.mov

After:

after.mov

• This change maintains backwards compatibility with previous Local Storage data (if modifying settings, experiments, or other persisted client state).

Upstreaming plan

• This commit should be sent as a patch to the upstream devtools-frontend repo following the contribution guide for Meta employees OR contribution guide.
  • A patch will be created
• This commit is React Native-specific and cannot be upstreamed.

[huntie]

Thanks so much for catching this finally 👏🏻