fix: added required parameters in Email notifications channel

[akshbhu]

Description of changes

FromAddress and Identity are required parameters in UpdateEmailChannel() sdk call which were missing in current Implementation

Issue #7464

Description of how you validated changes

• Tested manually

Checklist

• PR description included
• yarn test passes
• Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)

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 #7552 (486f46c) into master (312eec3) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #7552      +/-   ##
==========================================
- Coverage   52.76%   52.76%   -0.01%     
==========================================
  Files         523      523              
  Lines       26157    26158       +1     
  Branches     5119     5119              
==========================================
  Hits        13802    13802              
- Misses      11385    11386       +1     
  Partials      970      970              

Impacted Files	Coverage Δ
...mplify-category-notifications/lib/channel-Email.js	0.00% <0.00%> (ø)

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[github-actions]

👋 Hi, this pull request was referenced in the v5.0.2 release!

Check out the release notes here https://github.com/aws-amplify/amplify-cli/releases/tag/v5.0.2.