Remove Provider as parent class from QiskitRuntimeService

[kt474]

Summary

• Removed Qiskit Provider parent class from QiskitRuntimeService and FakeProviderForBackendV2
• Deprecated get_backend()
• Deprecated V1 fake backends
• Deprecated FakeProvider

Details and comments

Fixes #1589
Fixes #1261
Fixes #1604
Fixes #1505

[coveralls]

Pull Request Test Coverage Report for Build 9307679837

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 14 of 17 (82.35%) changed or added relevant lines in 3 files are covered.
• 3 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.05%) to 82.273%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
qiskit_ibm_runtime/qiskit_runtime_service.py	4	5	80.0%
qiskit_ibm_runtime/fake_provider/fake_provider.py	8	10	80.0%

Files with Coverage Reduction	New Missed Lines	%
qiskit_ibm_runtime/qiskit_runtime_service.py	1	78.72%
qiskit_ibm_runtime/fake_provider/fake_provider.py	2	62.9%

Totals
Change from base Build 9307538725:	0.05%
Covered Lines:	6001
Relevant Lines:	7294

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💛 - Coveralls