chore: run issue_comment github action only for issue comments

[thisisabhash]

Issue #

issue_comment github action keeps failing for pull request event as it doesn't have the required permissions to edit a pull request
https://github.com/aws-amplify/amplify-swift/actions/workflows/issue_comment.yml

Description

Run issue_comment only for issue comments

General Checklist

• Added new tests to cover change, if needed
• Build succeeds with all target using Swift Package Manager
• All unit tests pass
• All integration tests pass
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Documentation update for the change if required
• PR title conforms to conventional commit style
• New or updated tests include Given When Then inline code documentation and are named accordingly testThing_condition_expectation()
• If breaking change, documentation/changelog update with migration instructions

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.93%. Comparing base (68dda60) to head (2e6bc7c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4061       +/-   ##
===========================================
+ Coverage   68.00%   81.93%   +13.93%     
===========================================
  Files        1129      176      -953     
  Lines       54486    14234    -40252     
===========================================
- Hits        37051    11663    -25388     
+ Misses      17435     2571    -14864     

Flag	Coverage Δ
API_plugin_unit_test	?
AWSPluginsCore	?
Amplify	?
Analytics_plugin_unit_test	?
Auth_plugin_unit_test	?
DataStore_plugin_unit_test	83.45% <ø> (-0.06%)	⬇️
Geo_plugin_unit_test	?
Logging_plugin_unit_test	?
Predictions_plugin_unit_test	?
PushNotifications_plugin_unit_test	?
Storage_plugin_unit_test	78.90% <ø> (ø)
unit_tests	81.93% <ø> (+13.93%)	⬆️

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