fix(amplify-category-notifications): fix email channel removal

[UnleashedMind]

fix #5848

Issue #, if available:

Description of changes:

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

[codecov[bot]]

Codecov Report

Merging #6030 (7b942fc) into master (db9bf58) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           master    #6030    +/-   ##
========================================
  Coverage   58.21%   58.21%            
========================================
  Files         440      440            
  Lines       20160    20160            
  Branches     3988     3782   -206     
========================================
  Hits        11736    11736            
- Misses       7609     7629    +20     
+ Partials      815      795    -20     

Impacted Files	Coverage Δ
...mplify-category-notifications/lib/channel-Email.js	0.00% <ø> (ø)
packages/amplify-util-mock/src/api/api.ts	0.00% <0.00%> (ø)
packages/graphql-mapping-template/src/print.ts	35.29% <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)
...es/amplify-util-mock/src/api/resolver-overrides.ts	0.00% <0.00%> (ø)
...es/graphql-transformer-core/src/stripDirectives.ts	35.29% <0.00%> (ø)
.../amplify-cli-core/src/state-manager/pathManager.ts	67.85% <0.00%> (ø)
.../amplify-util-mock/src/utils/lambda/loadMinimal.ts	0.00% <0.00%> (ø)
...graphql-transformer-core/src/TransformerContext.ts	25.09% <0.00%> (ø)
... and 10 more

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[danielleadams]

@UnleashedMind I'd like to run the test suite on this, but do you mind rebasing on dev first? Thanks!

[danielleadams]

Closing due to inactivity.