Remove Qiskit Runtime retry loop

[garrison]

This removes the retry loop which would handle when Qiskit Runtime would return a result of None. The bug that caused this issue has been fixed in the service, so the retry loop is no longer necessary.

I'm in no hurry to merge this, but I wanted to open a PR nonetheless before we forget about it.

[coveralls]

Pull Request Test Coverage Report for Build 3442073556

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.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.3%) to 85.028%

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Files with Coverage Reduction	New Missed Lines	%
circuit_knitting_toolbox/entanglement_forging/entanglement_forging_knitter.py	4	84.38%

Totals
Change from base Build 3432365720:	0.3%
Covered Lines:	1522
Relevant Lines:	1790

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💛 - Coveralls

[caleb-johnson]

I support this whenever you think it's ready. I believe this call should be much more stable now