Change release workflows to use new staging bucket for artifacts

[gaiksaya]

Issue #, if available:

Description of changes:
The infrastructure team is separating the production and staging locations into different AWS accounts. Plugins need to modify their workflows to publish to the new locations. This PR changes the CD workflow to add a build number and write the zip artifact to staging.artifacts.opendistroforelasticsearch.amazon.com.

Test Results:
https://github.com/gaiksaya/kibana-reports/runs/1746023375?check_suite_focus=true

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Merging #301 (9cfb651) into dev (a11a63c) will decrease coverage by 13.50%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##                dev     #301       +/-   ##
=============================================
- Coverage     77.67%   64.16%   -13.51%     
- Complexity        0      291      +291     
=============================================
  Files            32      100       +68     
  Lines          1805     4044     +2239     
  Branches        356      614      +258     
=============================================
+ Hits           1402     2595     +1193     
- Misses          398     1288      +890     
- Partials          5      161      +156     

Flag	Coverage Δ	Complexity Δ
Kibana-reports	77.67% <ø> (?)	0.00 <ø> (?)
reports-scheduler	53.28% <ø> (?)	0.00 <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
...heduler/resthandler/ReportDefinitionRestHandler.kt	91.66% <0.00%> (ø)	8.00% <0.00%> (?%)
...sscheduler/model/GetAllReportDefinitionsRequest.kt	17.64% <0.00%> (ø)	5.00% <0.00%> (?%)
...search/reportsscheduler/action/PluginBaseAction.kt	27.65% <0.00%> (ø)	3.00% <0.00%> (?%)
...rtsscheduler/model/OnDemandReportCreateResponse.kt	33.33% <0.00%> (ø)	3.00% <0.00%> (?%)
...portsscheduler/model/GetReportDefinitionRequest.kt	18.51% <0.00%> (ø)	4.00% <0.00%> (?%)
...rch/reportsscheduler/index/ReportInstancesIndex.kt	46.45% <0.00%> (ø)	10.00% <0.00%> (?%)
...tsscheduler/scheduler/ReportDefinitionJobParser.kt	100.00% <0.00%> (ø)	2.00% <0.00%> (?%)
...rtsscheduler/action/GetAllReportInstancesAction.kt	66.66% <0.00%> (ø)	3.00% <0.00%> (?%)
...sscheduler/model/UpdateReportDefinitionResponse.kt	26.08% <0.00%> (ø)	3.00% <0.00%> (?%)
...rtsscheduler/action/InContextReportCreateAction.kt	66.66% <0.00%> (ø)	3.00% <0.00%> (?%)
... and 58 more

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