Simplify internal implementation details of EndsWith

[atifaziz]

This PR simplifies the implementation of EndsWith in the following ways:

• Folds the nested condition.
• Changes the local function (previously Impl) to be non-static so its signature can be simpler (it doesn't induce a closure).
• Avoids a closure with All by using SequenceEqual instead.
• Removes the unnecessary comparer initialization, which can be passed as-is to SequenceEqual.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.22%. Comparing base (5dc9e18) to head (e52d278).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1082      +/-   ##
==========================================
- Coverage   93.23%   93.22%   -0.01%     
==========================================
  Files         112      112              
  Lines        3400     3395       -5     
  Branches      962      960       -2     
==========================================
- Hits         3170     3165       -5     
  Misses        214      214              
  Partials       16       16              

Flag	Coverage Δ
	93.22% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.