chore: converted notifications category from JS to TS

[lazpavel]

Description of changes

• converts notifications category from JS to TS

Checklist

• PR description included
• yarn test passes
• Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)
• New AWS SDK calls or CloudFormation actions have been added to relevant test and service IAM policies

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

[lgtm-com]

This pull request fixes 2 alerts when merging df2b27e into ac31ec0 - view on LGTM.com

fixed alerts:

• 2 for Superfluous trailing arguments

[lgtm-com]

This pull request fixes 2 alerts when merging 24f7b23 into ac31ec0 - view on LGTM.com

fixed alerts:

• 2 for Superfluous trailing arguments

[lgtm-com]

This pull request fixes 2 alerts when merging 4c65fa7 into ac31ec0 - view on LGTM.com

fixed alerts:

• 2 for Superfluous trailing arguments

[codecov-commenter]

Codecov Report

Merging #11025 (4c65fa7) into dev (6ab0c99) will increase coverage by 1.02%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##              dev   #11025      +/-   ##
==========================================
+ Coverage   48.19%   49.22%   +1.02%     
==========================================
  Files         670      663       -7     
  Lines       32446    31779     -667     
  Branches     6598     6447     -151     
==========================================
+ Hits        15638    15643       +5     
+ Misses      15188    14650     -538     
+ Partials     1620     1486     -134     

Impacted Files	Coverage Δ
packages/amplify-cli-core/src/cliConstants.ts	100.00% <ø> (ø)
packages/amplify-cli-core/src/types.ts	100.00% <ø> (ø)
...fy-category-notifications/src/validate-filepath.ts	33.33% <33.33%> (ø)
...-category-notifications/src/apns-cert-p8decoder.ts	40.00% <40.00%> (ø)
...category-notifications/src/apns-cert-p12decoder.ts	14.92% <62.50%> (ø)
...amplify-category-notifications/src/channel-APNS.ts	64.42% <88.46%> (ø)
...ify-category-notifications/src/apns-cert-config.ts	88.88% <88.88%> (ø)
.../amplify-category-notifications/src/channel-FCM.ts	73.17% <92.85%> (ø)
...lify-category-notifications/src/apns-key-config.ts	91.66% <100.00%> (ø)
... and 7 more

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[akshbhu]

LGTM. Some minor modifications are added as comments

[lgtm-com]

This pull request fixes 2 alerts when merging a798fd6 into 262276a - view on LGTM.com

fixed alerts:

• 2 for Superfluous trailing arguments

[lgtm-com]

This pull request fixes 2 alerts when merging 90326ad into 262276a - view on LGTM.com

fixed alerts:

• 2 for Superfluous trailing arguments

[awsluja]

Overall solid refactor; just added some nit picks and some questions

[lgtm-com]

This pull request fixes 2 alerts when merging 07813a8 into 262276a - view on LGTM.com

fixed alerts:

• 2 for Superfluous trailing arguments