fix: #5372 - cut signing url ending slash when matching in mock

[attilah]

Issue #, if available:

fix: #5372

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #5434 into master will increase coverage by 0.00%.
The diff coverage is 78.57%.

@@           Coverage Diff            @@
##           master    #5434    +/-   ##
========================================
  Coverage   59.12%   59.12%            
========================================
  Files         399      399            
  Lines       17968    17975     +7     
  Branches     3370     3562   +192     
========================================
+ Hits        10623    10628     +5     
+ Misses       6718     6698    -20     
- Partials      627      649    +22     

Impacted Files	Coverage Δ
packages/amplify-category-auth/src/index.js	10.73% <0.00%> (ø)
...psync-model-plugin/src/visitors/appsync-visitor.ts	95.67% <ø> (ø)
...ppsync-simulator/src/utils/auth-helpers/helpers.ts	77.77% <50.00%> (-4.58%)	⬇️
...ugin/src/visitors/appsync-json-metadata-visitor.ts	94.52% <50.00%> (-1.26%)	⬇️
...en-appsync-model-plugin/src/utils/get-type-info.ts	90.00% <100.00%> (+2.50%)	⬆️
...ify-codegen/src/utils/getSchemaDownloadLocation.js	100.00% <100.00%> (ø)
packages/amplify-util-mock/src/api/api.ts	0.00% <0.00%> (ø)
packages/graphql-mapping-template/src/print.ts	34.65% <0.00%> (ø)
packages/amplify-util-mock/src/storage/storage.ts	0.00% <0.00%> (ø)
...ges/amplify-util-mock/src/CFNParser/stack/index.ts	0.00% <0.00%> (ø)
... and 16 more

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[github-actions]

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