gh-995: Allow filtering a single benchmark test

[connoraird]

Description

• Allows the passing of pytest flags to the benchmark and regression tests nox commands

Fixes: #995

Changelog entry

Added: Ability to run benchmarks/regression tests for a single test

Checks

• Is your code passing linting?
• Is your code passing tests?
• Have you added additional tests (if required)?
• Have you modified/extended the documentation (if required)?
• Have you added a one-liner changelog entry above (if required)?

[paddyroddy]

These need to be documented somewhere.

Also do you think it's clearest having one function rather than benchmark and benchmark_all? I know it's not very DRY, but I'm just thinking of other users that aren't us

[paddyroddy]

Why weren't we using these before?

[connoraird]

I think we just missed this.

[connoraird]

Also do you think it's clearest having one function rather than benchmark and benchmark_all? I know it's not very DRY, but I'm just thinking of other users that aren't us

I think it's clearer to have benchmarks and pass through the pytest args as that is what we do eslewhere, for example, in `tests.

[paddyroddy]

I think it's clearer to have benchmarks and pass through the pytest args as that is what we do eslewhere, for example, in `tests.

Okay, fair enough

[paddyroddy]

Looks good

[connoraird]

I missed out a call to _setup_array_backend(session) in the noxfile function benchmarks. I'll add it as part of #1064