Remove need for mutable reference to static (backport #13705)

[mergify]

Mutable references to static data are inherently unsafe and typically unsound in Rust, because statics are implicitly shared between threads, and the borrow checker can only enforce the shared/exclusive reference limitations within a single thread here.

This just moves the thread-exclusion logic into the individual elements of the static, where the GILOnceCell can correctly handle the runtime exclusion of multiple threads. (The GIL is no longer suitable for thread exclusion if we were doing a freethreaded Python build, but that's a problem we have all over Qiskit, and would need to change to OnceLock or the like.)

Summary

Details and comments

Minor conflict with the update to PyO3 0.23, but only a small syntactic one - the import_bound becomes import. The logic still works.

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This is an automatic backport of pull request #13705 done by Mergify.

[mergify]

Cherry-pick of 7b0b6fc has failed:

On branch mergify/bp/stable/1.3/pr-13705
Your branch is up to date with 'origin/stable/1.3'.

You are currently cherry-picking commit 7b0b6fcd.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   crates/circuit/src/operations.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   crates/circuit/src/imports.rs

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[qiskit-bot]

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[coveralls]

Pull Request Test Coverage Report for Build 12904198417

Details

• 6 of 6 (100.0%) changed or added relevant lines in 2 files are covered.
• 11 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.001%) to 88.916%

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Files with Coverage Reduction	New Missed Lines	%
crates/accelerate/src/unitary_synthesis.rs	1	93.21%
crates/qasm2/src/lex.rs	4	92.73%
crates/qasm2/src/parse.rs	6	96.69%

Totals
Change from base Build 12896571875:	0.001%
Covered Lines:	79156
Relevant Lines:	89023

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💛 - Coveralls