Add reporting backend to Codecov

[zhongnansu]

Issue #, if available:

Description of changes:

Update github actiuon script, use flag and directory parameter to enable uploading test coverage for multiple projects in one repo. In our case, kibana-reports plugin and reports-scheduler plugin.

Ref: https://docs.codecov.io/docs/flags

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[codecov]

Codecov Report

Merging #306 (5f4b1f9) into dev (a11a63c) will decrease coverage by 13.50%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##                dev     #306       +/-   ##
=============================================
- 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
...ortsscheduler/model/ReportInstanceSearchResults.kt	40.00% <0.00%> (ø)	2.00% <0.00%> (?%)
...csearch/reportsscheduler/ReportsSchedulerPlugin.kt	100.00% <0.00%> (ø)	9.00% <0.00%> (?%)
...ortsscheduler/model/OnDemandReportCreateRequest.kt	29.62% <0.00%> (ø)	4.00% <0.00%> (?%)
...earch/reportsscheduler/metrics/RollingCounter.java	62.06% <0.00%> (ø)	9.00% <0.00%> (?%)
...search/reportsscheduler/security/SecurityAccess.kt	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)
...tsscheduler/scheduler/ReportDefinitionJobRunner.kt	12.50% <0.00%> (ø)	1.00% <0.00%> (?%)
...reportsscheduler/model/GetReportInstanceRequest.kt	18.51% <0.00%> (ø)	4.00% <0.00%> (?%)
...rtsscheduler/model/OnDemandReportCreateResponse.kt	33.33% <0.00%> (ø)	3.00% <0.00%> (?%)
...tsscheduler/model/GetAllReportInstancesResponse.kt	38.46% <0.00%> (ø)	2.00% <0.00%> (?%)
...heduler/model/UpdateReportInstanceStatusRequest.kt	52.38% <0.00%> (ø)	4.00% <0.00%> (?%)
... and 58 more

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