Refactor workflows and improve code formatting across multiple files

[MohamedLaghdafHABIBOULLAH]

@dpo I placed the pre-commit changes here so that the linting test for BP passes.

[codecov]

Codecov Report

❌ Patch coverage is 69.44444% with 11 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (wip-bestie@94ff43d). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/testset_nnmf.jl	0.00%	8 Missing ⚠️
src/testset_bpdn.jl	50.00%	3 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             wip-bestie      #77   +/-   ##
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  Coverage              ?   75.97%           
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  Files                 ?       22           
  Lines                 ?      462           
  Branches              ?        0           
=============================================
  Hits                  ?      351           
  Misses                ?      111           
  Partials              ?        0           

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[MohamedLaghdafHABIBOULLAH]

@dpo The main change I made here was to avoid the error where grad is not imported in the package, while grad! is.

[MohamedLaghdafHABIBOULLAH]

Here @dpo, I specified the imports we use so that the ExplicitImports checks pass.

[MohamedLaghdafHABIBOULLAH]

If we could merge this as soon as possible, that would be great.

[dpo]

I don't think it's possible to add conditionals to Project.toml. The possible solutions are:

1. we don't run unit tests on FreeBSD
2. we disable precompilation always by adding __precompile__(false) at the top of the module (I think)
3. we disable precompilation on Cirrus by setting the environment variable JULIA_PKG_PRECOMPILE_AUTO=0 in .cirrus.yml (I think)
4. we exclude FH from the unit tests but use it in the benchmarks.

We could try 3. If it doesn't work, we'll do 4. What do you think?

[dpo]

@MohamedLaghdafHABIBOULLAH Please resolve the remaining issue with FreeBSD.