Remove conda workflow temporarily

[jhdark]

Proposed changes

For now the installation of the fenics-dolfinx conda environment is very unreliable, often failing to initialise despite no change in how its defined. I propose that we halt testing on conda temporarily until It becomes more stable.

Types of changes

What types of changes does your code introduce to FESTIM?

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code refactoring
• Documentation Update (if none of the other choices apply)
• New tests

Checklist

• Black formatted
• Unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (a2fc5c3) 95.83% compared to head (b1f529f) 95.83%.

Additional details and impacted files

@@           Coverage Diff            @@
##           fenicsx     #608   +/-   ##
========================================
  Coverage    95.83%   95.83%           
========================================
  Files           10       10           
  Lines          264      264           
========================================
  Hits           253      253           
  Misses          11       11           

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[RemDelaporteMathurin]

No need to remove the workflow file we can pause it in the settings