Upgrade Notifications and Notifications Dashboards to 2.1

[qreshi]

Description

• Upgrading Notifications backend to 2.1
• Upgrades gradle version to 7.4.2
• Upgrading Notifications Dashboards to 2.1
• Adds postbuild renaming script for Notifications Dashboards artifact
• Updates GitHub Action for build and testing Notifications Dashboards

Issues Resolved

[List any issues this PR will resolve]

Check List

• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov-commenter]

Codecov Report

Merging #468 (f501a5b) into main (7af4099) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #468   +/-   ##
=========================================
  Coverage     71.01%   71.01%           
  Complexity      112      112           
=========================================
  Files           124      124           
  Lines          3923     3923           
  Branches        626      626           
=========================================
  Hits           2786     2786           
  Misses          961      961           
  Partials        176      176           

Flag	Coverage Δ
dashboards-notifications	86.40% <ø> (ø)
opensearch-notifications	61.70% <ø> (ø)

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