Adding support to edit/create notifications using channels in IM

[thalurur]

Description

[Describe what this change achieves]
Support visual policy creation for new notification channels

Legacy notification - only edit is allowed

New notification - create/edit is allowed

Issues Resolved

N/A

Check List

• Commits are signed per the DCO using --signoff

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[codecov-commenter]

Codecov Report

Merging #181 (093fc02) into main (ff0d056) will decrease coverage by 1.47%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #181      +/-   ##
==========================================
- Coverage   63.32%   61.85%   -1.48%     
==========================================
  Files         155      158       +3     
  Lines        4447     4632     +185     
  Branches      696      732      +36     
==========================================
+ Hits         2816     2865      +49     
- Misses       1415     1546     +131     
- Partials      216      221       +5     

Impacted Files	Coverage Δ
...containers/ErrorNotification/ErrorNotification.tsx	84.61% <0.00%> (-15.39%)	⬇️
...mponents/EuiFormCustomLabel/EuiFormCustomLabel.tsx	80.00% <0.00%> (-7.50%)	⬇️
...m/components/DefineTransforms/DefineTransforms.tsx	69.64% <0.00%> (-5.36%)	⬇️
...ntainers/VisualCreatePolicy/VisualCreatePolicy.tsx	11.66% <0.00%> (-0.84%)	⬇️
...n/public/pages/VisualCreatePolicy/utils/helpers.ts	68.36% <0.00%> (-0.71%)	⬇️
...-dashboards-plugin/public/index_management_app.tsx	7.14% <0.00%> (-0.55%)	⬇️
...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	75.00% <0.00%> (ø)
... and 4 more

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