Deterministic benchmarks

[Saransh-cpp]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes #2954

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 (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 run-tests.py --all
• The documentation builds: $ python run-tests.py --doctest

You can run unit and doctests together at once, using $ python run-tests.py --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

Patch coverage: 100.00% and project coverage change: -0.01 ⚠️

Comparison is base (57d06db) 99.71% compared to head (844ae12) 99.70%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2995      +/-   ##
===========================================
- Coverage    99.71%   99.70%   -0.01%     
===========================================
  Files          245      245              
  Lines        18705    18701       -4     
===========================================
- Hits         18651    18646       -5     
- Misses          54       55       +1     

Impacted Files	Coverage Δ
pybamm/solvers/casadi_solver.py	99.33% <100.00%> (-0.34%)	⬇️

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