[Backport 2.x] [Multiple Datasource Test] Add test for error_menu, item, data_source_multi_selectable

[opensearch-trigger-bot[bot]]

Backport d920951800978f8e66da6e0d1c5347d1c029c28c from #6752.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 67.59%. Comparing base (45d9e6c) to head (045ebc0).

Additional details and impacted files

@@           Coverage Diff           @@
##              2.x    #6768   +/-   ##
=======================================
  Coverage   67.58%   67.59%           
=======================================
  Files        3427     3427           
  Lines       67352    67352           
  Branches    10982    10982           
=======================================
+ Hits        45521    45526    +5     
+ Misses      19164    19160    -4     
+ Partials     2667     2666    -1     

Flag	Coverage Δ
Linux_1	33.07% <ø> (ø)
Linux_2	55.16% <ø> (ø)
Linux_3	45.20% <ø> (+0.01%)	:arrow_up:
Linux_4	34.87% <ø> (ø)
Windows_1	33.10% <ø> (ø)
Windows_2	55.13% <ø> (ø)
Windows_3	45.21% <ø> (+0.02%)	:arrow_up:
Windows_4	34.87% <ø> (ø)

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[ZilongX]

pick up latest changes from 2.x branch