Update GitHub Actions to run on all branches

[qreshi]

Signed-off-by: Mohammad Qureshi [email protected]

Issue #, if available:

Description of changes:

• Updating GitHub Actions to run on all branches (so it includes the x.x branches)
• Removing the release-workflow as it has no longer used

CheckList:
[x] 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 #256 (0f49e97) into main (6ff9889) will increase coverage by 0.21%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main     #256      +/-   ##
============================================
+ Coverage     78.41%   78.63%   +0.21%     
- Complexity      211      214       +3     
============================================
  Files           173      173              
  Lines          6959     6959              
  Branches        912      912              
============================================
+ Hits           5457     5472      +15     
+ Misses         1018     1005      -13     
+ Partials        484      482       -2     

Impacted Files	Coverage Δ
...ing/model/destination/DestinationContextFactory.kt	66.66% <0.00%> (ø)
...e/action/node/ScheduledJobsStatsTransportAction.kt	75.51% <0.00%> (ø)
...ain/kotlin/org/opensearch/alerting/AlertService.kt	79.02% <0.00%> (+0.48%)	⬆️
...in/kotlin/org/opensearch/alerting/MonitorRunner.kt	72.05% <0.00%> (+0.67%)	⬆️
.../opensearch/alerting/core/schedule/JobScheduler.kt	76.38% <0.00%> (+6.94%)	⬆️
...rch/alerting/core/action/node/ScheduledJobStats.kt	66.66% <0.00%> (+11.11%)	⬆️
...arch/alerting/core/schedule/JobSchedulerMetrics.kt	72.22% <0.00%> (+16.66%)	⬆️

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