fix: allow pinpoint category removal after manual deletion

[johnpc]

Description of changes

This PR fixes an issue where, if a Pinpoint project is deleted manually via AWS Console, the notifications category could not be removed from the amplify project. It accomplishes this by treating a NotFoundException on deletion as a successful deletion.

Issue #, if available

#9036

Description of how you validated changes

amplify add notifications && amplify push
delete pinpoint manually
amplify remove notifications && amplify push
# note that everything seems to work on AWS console/amplify status
amplify pull/push no longer recreates the notifications category.

Checklist

• PR description included
• yarn test passes

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

[codecov-commenter]

Codecov Report

Merging #9691 (9ce67a2) into master (4a87373) will decrease coverage by 0.04%.
The diff coverage is 31.63%.

@@            Coverage Diff             @@
##           master    #9691      +/-   ##
==========================================
- Coverage   52.93%   52.89%   -0.05%     
==========================================
  Files         829      830       +1     
  Lines       45865    45957      +92     
  Branches     9789     9815      +26     
==========================================
+ Hits        24279    24308      +29     
- Misses      19581    19634      +53     
- Partials     2005     2015      +10     

Impacted Files	Coverage Δ
...mplify-category-notifications/lib/channel-Email.js	0.00% <0.00%> (ø)
...lify-category-notifications/lib/pinpoint-helper.js	0.00% <0.00%> (ø)
...amplify-cli-core/src/feature-flags/featureFlags.ts	80.83% <ø> (ø)
...c/extensions/amplify-helpers/auth-notifications.ts	34.14% <34.14%> (ø)
...l-auth-transformer/src/graphql-auth-transformer.ts	89.62% <50.00%> (ø)
packages/graphql-transformer-core/src/index.ts	97.29% <100.00%> (+0.07%)	⬆️

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[github-actions]

👋 Hi, this pull request was referenced in the v7.6.19 release!

Check out the release notes here https://github.com/aws-amplify/amplify-cli/releases/tag/v7.6.19.