Provide quiet status specialization for python

[nvmkuruc]

Description of Change(s)

Tf_PythonCallContext assumes that a valid moduleName and functionName are available and joins them with .. However, when Tf.Status is called with verbose=False, moduleName and functionName are both empty.

This yields a non-empty fullName of . when consumed by downstream diagnostic delegates that could be confusing.

This PR introduces a "quiet" version of _Status which bypasses Tf_PyCallContext and provides an explicitly empty TfCallContext.

Link to proposal (if applicable)

Fixes Issue(s)

#3311

Checklist

• I have created this PR based on the dev branch

• I have followed the coding conventions

• I have added unit tests that exercise this functionality (Reference:
  testing guidelines)

• I have verified that all unit tests pass with the proposed changes

• I have submitted a signed Contributor License Agreement (Reference:
  Contributor License Agreement instructions)

[jesschimein]

Filed as internal issue #USD-10934

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[jesschimein]

/AzurePipelines run

[tallytalwar]

/AzurePipelines run

[jesschimein]

/AzurePipelines run