fix(ui): use label class for silence matchers to prevent overflow

[prymitive]

No description provided.

[codecov]

Codecov Report

Merging #682 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #682   +/-   ##
=======================================
  Coverage   84.42%   84.42%           
=======================================
  Files         118      118           
  Lines        3903     3903           
  Branches      337      337           
=======================================
  Hits         3295     3295           
  Misses        500      500           
  Partials      108      108

Flag	Coverage Δ
#backend	71.86% <ø> (ø)	⬆️
#ui	100% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
...Grid/AlertGrid/AlertGroup/Silence/DeleteSilence.js	100% <ø> (ø)	⬆️
...ponents/Grid/AlertGrid/AlertGroup/Silence/index.js	100% <100%> (ø)	⬆️

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