LandingPage: Add Edge decommission alert (HMS-6156)

[ochosi]

This alert will only be shown when the 'immutable' tab has focus.
Below are screenshots of both tabs.

This will likely require further work after UX mockups are complete/ready. E.g. do we want to use this alert type? Is the copy correct/complete?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.66%. Comparing base (efed39d) to head (0f202d4).

@@            Coverage Diff             @@
##             main    #3210      +/-   ##
==========================================
+ Coverage   84.65%   84.66%   +0.01%     
==========================================
  Files         187      187              
  Lines       23491    23507      +16     
  Branches     2455     2455              
==========================================
+ Hits        19886    19902      +16     
  Misses       3586     3586              
  Partials       19       19              

Files with missing lines	Coverage Δ
...Components/sharedComponents/ImageBuilderHeader.tsx	97.76% <100.00%> (+0.30%)	⬆️

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[regexowl]

LGTM, thank you! ❤️ Is this still a draft/blocked by something? Happy to merge when ready.

[ochosi]

@regexowl TY ❤️
It's a draft mostly because the UX mockups didn't seem final and we're unsure when to publish this, I think

[ochosi]

Update: This is scheduled to land on May 30, so I'll keep it a draft until then.