1D+ sensitivities error with IDAKLU output_variables

[pipliggins]

Description

When using output_variables, sensitivity calculations were incorrect for 1D+ variables, and all variables which followed them in the output_variables list. This is a bug in the C++ code stored in pybammsolvers so a seperate PR will be made there, this one just adds tests to pybamm that catch the bug and should pass once the solvers package is fixed and updated.

Fixes #5058

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #)

[pipliggins]

Requires: pybamm-team/pybammsolvers#52

[MarcBerliner]

@pipliggins pybammsolvers was updated with your required PR. We plan to release pybamm soon, and it'd be good to include this PR. Is this ready for review?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.80%. Comparing base (847723e) to head (cc1cc67).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #5118   +/-   ##
========================================
  Coverage    98.80%   98.80%           
========================================
  Files          320      320           
  Lines        27034    27034           
========================================
  Hits         26711    26711           
  Misses         323      323           

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[pipliggins]

@pipliggins pybammsolvers was updated with your required PR. We plan to release pybamm soon, and it'd be good to include this PR. Is this ready for review?

@MarcBerliner Yes! I'll mark it ready.

[MarcBerliner]

Looks good!