Minor Refactor of ExecutorchRuntimeException

[psiddh]

• Add dedicated helper function to retreive detailed error logs
• Make ExecutorchInvalidArgumentException extend ExecutorchRuntimeException

Summary

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Test plan

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 43b5e9c with merge base ee236cb ():

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• pull / android / run-emulator (gh) (#16137)
  Timeout waiting for emulator to boot.

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