Removes support for notification channels

[dbbaughe]

Signed-off-by: Drew Baugher 46505179+dbbaughe@users.noreply.github.com

Description

Removes all backend routes/services relating to notification.
Removes all notification service and all usages of it.
Removes all usages of channels and any UI relating to channels.
The error notification is now just the JSON editor for what was the legacy error notifications.
Same for the notification action flyout.

Check List

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[codecov-commenter]

Codecov Report

Merging #81 (090e8b4) into main (b284bd1) will increase coverage by 0.21%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
+ Coverage   50.03%   50.24%   +0.21%     
==========================================
  Files         156      154       -2     
  Lines        4297     4221      -76     
  Branches      678      664      -14     
==========================================
- Hits         2150     2121      -29     
+ Misses       1993     1950      -43     
+ Partials      154      150       -4     

Impacted Files	Coverage Δ
...licy/components/UIActions/NotificationUIAction.tsx	4.34% <0.00%> (-4.28%)	⬇️
...ex-management-dashboards-plugin/utils/constants.ts	100.00% <0.00%> (ø)
...ement-dashboards-plugin/public/pages/Main/Main.tsx	10.00% <0.00%> (ø)
...public/pages/VisualCreatePolicy/utils/constants.ts	100.00% <0.00%> (ø)
...mponents/LegacyNotification/LegacyNotification.tsx	71.42% <0.00%> (ø)
...ards-plugin/public/services/NotificationService.ts
...onents/ChannelNotification/ChannelNotification.tsx
...-dashboards-plugin/public/index_management_app.tsx	7.69% <0.00%> (+0.54%)	⬆️
...ntainers/VisualCreatePolicy/VisualCreatePolicy.tsx	13.88% <0.00%> (+0.95%)	⬆️
...containers/ErrorNotification/ErrorNotification.tsx	100.00% <0.00%> (+15.38%)	⬆️

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[bowenlan-amzn]

Looks good!