Fix global phase in inverse of UCGate and Isometry

[israelferrazaraujo]

Summary

The inverse() of the UCGate class is defined by simply inverting the existing decomposition, but the inverse of the global phase was missing.

Details and comments

The existing tests did not cover the inverse() function of the UCGate class, so I also included a new test.

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[Cryoris]

Thanks for the fix! Could you also add a releasenote? 🙂

[adjs]

Thanks, @israelferrazaraujo. This PR also makes Isometry decomposition phase correct #4687.

[israelferrazaraujo]

Thanks for the fix! Could you also add a releasenote? slightly_smiling_face

Hi @Cryoris, I have added the release notes.

[coveralls]

Pull Request Test Coverage Report for Build 2845394035

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.003%) to 84.05%

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Files with Coverage Reduction	New Missed Lines	%
qiskit/extensions/quantum_initializer/squ.py	2	79.78%
<!--	Total:	2

Totals
Change from base Build 2845105967:	-0.003%
Covered Lines:	56315
Relevant Lines:	67002

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💛 - Coveralls

[israelferrazaraujo]

LGTM thanks a lot for the contribution!

It's good to contribute to Qiskit. I hope to do more in the future.