Fix unnecessary serialisation of PassManager in serial contexts (backport #12410)

[mergify]

Summary

This exposes the interal decision in parallel_map of whether to actually run in serial or not. If not, there's no need for PassManager to side-car its dill serialisation onto the side of the IPC (we use dill because we need to pickle lambdas), which can be an unfortunately huge cost for certain IBM pulse-enabled backends.

Details and comments

@sbrandhsn: as the release manager for 1.1.0, it's up to you whether you want to accept this PR in this form for 1.1.0, or defer to 1.1.1 (you can tag the milestone appropriately). I could also suppress exporting should_run_in_parallel into the public namespace if you're not on board with a new public feature this late into the release cycle.

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This is an automatic backport of pull request #12410 done by Mergify.

[mergify]

Cherry-pick of b12e9ec has failed:

On branch mergify/bp/stable/0.46/pr-12410
Your branch is up to date with 'origin/stable/0.46'.

You are currently cherry-picking commit b12e9ec3c.
  (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:   qiskit/passmanager/passmanager.py
	new file:   releasenotes/notes/parallel-check-8186a8f074774a1f.yaml

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   qiskit/utils/__init__.py
	both modified:   qiskit/utils/parallel.py

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 9419158300

Details

• 12 of 12 (100.0%) changed or added relevant lines in 3 files are covered.
• 39 unchanged lines in 5 files lost coverage.
• Overall coverage decreased (-0.04%) to 86.911%

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Files with Coverage Reduction	New Missed Lines	%
qiskit/utils/parallel.py	2	65.67%
qiskit/passmanager/passmanager.py	4	87.37%
crates/qasm2/src/lex.rs	4	92.88%
crates/accelerate/src/euler_one_qubit_decomposer.rs	7	91.84%
crates/accelerate/src/sabre_swap/neighbor_table.rs	22	57.81%

Totals
Change from base Build 9314544782:	-0.04%
Covered Lines:	74980
Relevant Lines:	86272

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💛 - Coveralls