Setting noise_info to false in GenericBackendV2 creates issues later in the transpiler pipeline (backport #12769)

[mergify]

Summary

Fixes bugs introduced in #12747

Details and comments

I added some tests to check whether transpiling with noise-less and/or pulse-channel-less backends still works and noticed test failures. I fixed these bugs and added the corresponding test cases. I don't think this warrants a new release note but let me know if you disagree. :-)

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This is an automatic backport of pull request #12769 done by [Mergify](https://mergify.com).

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[coveralls]

Pull Request Test Coverage Report for Build 10111872573

Details

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• 5 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.005%) to 89.953%

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Files with Coverage Reduction	New Missed Lines	%
crates/qasm2/src/expr.rs	1	94.02%
crates/qasm2/src/lex.rs	4	92.62%

Totals
Change from base Build 10111125380:	0.005%
Covered Lines:	66098
Relevant Lines:	73481

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💛 - Coveralls