[jest-lite]: Support test mode and jsx files

[mattphillips]

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What kind of change does this PR introduce?

• Add support for .jsx test files (.tsx is already supported so seems strange that jsx isn't - not sure if I missing something?)
• Add missing mode value to Codesandbox add_test event. This value is part of the jest-circus event and would be useful to propagate as part of the codesandbox event.

By adding this missing mode it will be easier to report the tests correctly in SandpackTests which currently assumes anything not running/pass/fail to be skipped which isn't strictly true.

You can see that mode is part of the jest-circus event type here and here

cc/ @danilowoz

What is the current behavior?

• jsx tests aren't found
• mode isn't sent as part of the payload

What is the new behavior?

• jsx tests should be found
• mode will be sent as part of the payload

What steps did you take to test this? This is required before we can merge, make sure to test the flow you've updated.

I've not tested this

Checklist

• Documentation
• Testing
• Ready to be merged
  
• Added myself to contributors table
  

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