Update `snaps-jest` docs

[ziad-saab]

• More descriptive names for tests
• Remove parameters to snap.onHomepage
• Remove references to executionEnvironmentUrl and simulatorUrl

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (01829d3) 96.54% compared to head (b7a9502) 96.54%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2181   +/-   ##
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  Coverage   96.54%   96.54%           
=======================================
  Files         331      331           
  Lines        7463     7463           
  Branches     1146     1146           
=======================================
  Hits         7205     7205           
  Misses        258      258           

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