Update SMT retirement notice to include a date

[Nateowami]

Before

After

Changes

• More scary (we haven't gotten messages as a result of the existing notice)
• Clearer message ("removed" instead of "retired")
• Email link
• Date specified

Disabling SMT can be done on a per-project basis, which will automatically make the message disappear.

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This change is 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.92%. Comparing base (474dc16) to head (de9e611).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3958   +/-   ##
=======================================
  Coverage   80.91%   80.92%           
=======================================
  Files         636      637    +1     
  Lines       41240    41245    +5     
  Branches     6724     6702   -22     
=======================================
+ Hits        33371    33376    +5     
- Misses       6814     6827   +13     
+ Partials     1055     1042   -13     

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[RaymondLuong3]

Nice. We have to make sure that the changes in the .json files are merged and released together with this change.

@RaymondLuong3 reviewed 8 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on Nateowami).

[Nateowami]

@RaymondLuong3 It's a new i18n key so it will just fall back to English.