[Backport 2.x] add concurrent limit on datasource and sessions

[opensearch-trigger-bot]

Backport d3ce049 from #2390.

[codecov]

Codecov Report

Merging #2394 (5661e00) into 2.x (56bd9dc) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                2.x    #2394      +/-   ##
============================================
- Coverage     95.61%   95.60%   -0.01%     
- Complexity     4955     4959       +4     
============================================
  Files           469      472       +3     
  Lines         13835    13842       +7     
  Branches        918      924       +6     
============================================
+ Hits          13228    13234       +6     
  Misses          587      587              
- Partials         20       21       +1     

Flag	Coverage Δ
sql-engine	95.60% <100.00%> (-0.01%)	⬇️

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

Files	Coverage Δ
...ces/transport/TransportCreateDataSourceAction.java	100.00% <100.00%> (ø)
...rch/sql/opensearch/setting/OpenSearchSettings.java	100.00% <100.00%> (ø)
...search/sql/spark/dispatcher/AsyncQueryHandler.java	100.00% <ø> (ø)
...search/sql/spark/dispatcher/BatchQueryHandler.java	100.00% <100.00%> (ø)
.../sql/spark/dispatcher/InteractiveQueryHandler.java	100.00% <100.00%> (ø)
...rch/sql/spark/dispatcher/SparkQueryDispatcher.java	100.00% <100.00%> (ø)
...ch/sql/spark/dispatcher/StreamingQueryHandler.java	100.00% <100.00%> (ø)
...ch/sql/spark/execution/session/SessionManager.java	100.00% <ø> (ø)
...rch/sql/spark/execution/statestore/StateStore.java	81.75% <100.00%> (-0.27%)	⬇️
...easemanager/ConcurrencyLimitExceededException.java	100.00% <100.00%> (ø)
... and 1 more

... and 1 file with indirect coverage changes

[penghuo]

Flaky test: string format issue. will fix in #2386