fix(ui): ignore <secret> placeholder in string length validation

[JosephKav]

Teams has validaion for 32-character UUID string lengths (though we just allow alphanumberic of 32-36 to allow for -'s)

When you have a Teams notifier saved, the API will return <secret> as the field value. This validation would then fail as <secret> is less than 32 characters :/. So I've changed the validation to allow <secret>

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.96%. Comparing base (1e25ecf) to head (7cc458a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #797   +/-   ##
=======================================
  Coverage   98.96%   98.96%           
=======================================
  Files         137      137           
  Lines        9224     9224           
=======================================
  Hits         9128     9128           
  Misses         73       73           
  Partials       23       23           

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