Add lychee link checker with pre-commit

[jbampton]

Description

This PR closes #11867

I have created a default lychee.toml config file with some excluded links.

We could fix these broken links later and also improve the config etc.

This link checker test or hook will hopefully stop regressions and I made it a manual hook.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• Build/CI
• Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

Ran pre-commit locally. Tested the manual hooks

How did you try to break this feature and the system with this change?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 17.56%. Comparing base (ac3b180) to head (0cb8949).

Additional details and impacted files

@@            Coverage Diff            @@
##               main   #12068   +/-   ##
=========================================
  Coverage     17.56%   17.56%           
- Complexity    15534    15539    +5     
=========================================
  Files          5911     5911           
  Lines        529359   529359           
  Branches      64655    64655           
=========================================
+ Hits          92957    92977   +20     
+ Misses       425945   425923   -22     
- Partials      10457    10459    +2     

Flag	Coverage Δ
uitests	3.58% <ø> (ø)
unittests	18.63% <ø> (+<0.01%)	⬆️

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