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Fix SparsePauliOp.is_unitary() to respect input tolerance values (#14676)

* Fix SparsePauliOp.is_unitary() to respect input tolerance values

Fixes #14107 by passing the tolerance parameters from is_unitary() to simplify().
This ensures that the tolerance values are properly respected when checking
if an operator is unitary.

The change includes a test case that verifies the fix works as expected.

* Fix SparsePauliOp.is_unitary() to respect input tolerance values

This commit fixes issue #14107 by ensuring that the tolerance values passed to
is_unitary() are properly used when checking if the operator is unitary. The
tolerances are now correctly passed through to the internal operations.

* Update docstring to better explain how tolerance parameters are used
* Add test case to verify tolerance behavior
* Add release note for the bug fix

* update based on  Cryoris' comments

* format test file with black and update release notes based on comments

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