add Learn more link for cert key error when turning on windows mdm

[ghernandez345]

For #26047

adds a "learn more" link on the cert/key pair error when turning on windows.

This also updates the CustomLink to add new variant for when we want to display this in a flash message

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
• Manual QA for all new/changed functionality

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.63%. Comparing base (329c454) to head (867f0e5).
Report is 64 commits behind head on main.

Files with missing lines	Patch %	Lines
frontend/components/CustomLink/CustomLink.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #26170   +/-   ##
=======================================
  Coverage   63.63%   63.63%           
=======================================
  Files        1631     1631           
  Lines      156363   156359    -4     
  Branches     4045     4090   +45     
=======================================
  Hits        99505    99505           
+ Misses      49017    49012    -5     
- Partials     7841     7842    +1     

Flag	Coverage Δ
frontend	53.50% <50.00%> (+0.01%)	⬆️

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[sgress454]

Tested 👍 , code LGTM. I'd say we should link directly to the part of the guide that's specific to setting up certs, but it's the very first part anyway.

[ghernandez345]

Tested 👍 , code LGTM. I'd say we should link directly to the part of the guide that's specific to setting up certs, but it's the very first part anyway.

@sgress454 sounds good. made this change. Can i get a rereview?