block_to_split supports list str in CaptureSplitInfo pass

[xieofxie]

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• Add unit tests for this change.
• Make sure all tests can pass.
• Update documents if necessary.
• Lint and apply fixes to your code by running lintrunner -a
• Is this a user-facing change? If yes, give a description of this change to be included in the release notes.
  block_to_split supports list str in CaptureSplitInfo pass
• Is this PR including examples changes? If yes, please remember to update example documentation in a follow-up PR.

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[xieofxie]

@jambayk I pushed to Olive and created a new pr. This test failed but I think it should not be so

test_bert[bert_ptq_cpu.json-local_system-joint-tpe]

could you help to take a look?

[jambayk]

Thanks! Opened this PR to fix the flaky test #1612

[jambayk]

/azp run

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