[Backport 2.x] Fixes misleading embeddable plugin error message

[opensearch-trigger-bot]

Backport bd52024 from #3043.

[codecov-commenter]

Codecov Report

Merging #3154 (7914ec8) into 2.x (0a92e60) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              2.x    #3154      +/-   ##
==========================================
- Coverage   66.67%   66.67%   -0.01%     
==========================================
  Files        3219     3219              
  Lines       61450    61450              
  Branches     9417     9417              
==========================================
- Hits        40971    40969       -2     
+ Misses      18232    18208      -24     
- Partials     2247     2273      +26     

Flag	Coverage Δ
Linux	66.67% <ø> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
src/plugins/embeddable/public/lib/errors.ts	100.00% <ø> (ø)
...ared/static/forms/hook_form_lib/hooks/use_field.ts	65.70% <0.00%> (-0.97%)	⬇️
packages/osd-optimizer/src/node/cache.ts	50.00% <0.00%> (ø)
packages/osd-test/src/junit_report_path.ts	62.50% <0.00%> (ø)
packages/osd-optimizer/src/run_optimizer.ts	23.52% <0.00%> (ø)
packages/osd-optimizer/src/log_optimizer_state.ts	4.54% <0.00%> (ø)
...ckages/osd-optimizer/src/report_optimizer_stats.ts	21.42% <0.00%> (ø)
...s/osd-optimizer/src/node/node_auto_tranpilation.ts	83.67% <0.00%> (ø)
...est_runner/lib/docker_servers/container_running.ts	11.76% <0.00%> (ø)
...unner/lib/docker_servers/docker_servers_service.ts	28.98% <0.00%> (ø)

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