Make particle mechanics work with composite electrodes

[aabills]

Description

Makes particle mechanics work with composite electrodes

Fixes # (issue)

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist:

• No style issues: $ pre-commit run (or $ nox -s pre-commit) (see CONTRIBUTING.md for how to set this up to run automatically when committing locally, in just two lines of code)
• All tests pass: $ python -m pytest (or $ nox -s tests)
• The documentation builds: $ python -m pytest --doctest-plus src (or $ nox -s doctests)

You can run integration tests, unit tests, and doctests together at once, using $ nox -s quick.

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.22%. Comparing base (a7253b8) to head (480e632).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4698   +/-   ##
========================================
  Coverage    99.22%   99.22%           
========================================
  Files          303      303           
  Lines        23070    23077    +7     
========================================
+ Hits         22891    22898    +7     
  Misses         179      179           

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[SagarPal8894]

Hi @aabills and @rtimms, Apologies for the above reverting commit made mistakenly. It is completely unintentional and is not implying anything.
Thanks.

[aabills]

Hey @SagarPal8894, no worries, it looks like that is on your fork of pybamm, on which you are free to do whatever you please.

[SagarPal8894]

Hey @aabills and @rtimms , it would be great if you guys also look at the composite electrode porosity change compatibility with cracking particle mechanics also.
Thanks.
#4417 by @DrSOKane