#2789 add "all" to sensitivities for idaklu solver

[martinjrobins]

Description

Partially fixes #2789 and unblocks #2858

Type of change

• 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 no project coverage change.

Comparison is base (1d6bd48) 99.69% compared to head (d3391b0) 99.69%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2883   +/-   ##
========================================
  Coverage    99.69%   99.69%           
========================================
  Files          273      273           
  Lines        19083    19084    +1     
========================================
+ Hits         19024    19025    +1     
  Misses          59       59           

Impacted Files	Coverage Δ
pybamm/solvers/idaklu_solver.py	98.99% <100.00%> (+<0.01%)	⬆️

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[valentinsulzer]

Thanks!