jest-circus: remove switch with single case

[Connormiha]

Summary

Removed switch with only one case(replaced by if).

Test plan

[codecov-io]

Codecov Report

Merging #9166 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master    #9166   +/-   ##
=======================================
  Coverage   64.82%   64.82%           
=======================================
  Files         279      279           
  Lines       11740    11740           
  Branches     2884     2884           
=======================================
  Hits         7610     7610           
+ Misses       3512     3511    -1     
- Partials      618      619    +1

Impacted Files	Coverage Δ
packages/jest-circus/src/formatNodeAssertErrors.ts	12.96% <0%> (ø)	⬆️

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[github-actions]

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