[Backport workspace] patch with retire dashboard management and add unit test for mountWrapper

[opensearch-workspace-development]

Backport 0906bf4 from #223.

[codecov-commenter]

Codecov Report

Merging #224 (d8c43b0) into workspace (c57e880) will increase coverage by 0.05%.
Report is 1 commits behind head on workspace.
The diff coverage is 50.00%.

@@              Coverage Diff              @@
##           workspace     #224      +/-   ##
=============================================
+ Coverage      66.16%   66.22%   +0.05%     
=============================================
  Files           2709     3422     +713     
  Lines          51011    65748   +14737     
  Branches        9207    10587    +1380     
=============================================
+ Hits           33752    43540    +9788     
- Misses         14972    19565    +4593     
- Partials        2287     2643     +356     

Flag	Coverage Δ
Linux_1	30.42% <16.66%> (?)
Linux_2	55.35% <ø> (ø)
Linux_3	42.78% <37.50%> (+0.01%)	⬆️
Linux_4	34.53% <33.33%> (+0.01%)	⬆️

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Files	Coverage Δ
...ement_app/components/page_wrapper/page_wrapper.tsx	100.00% <100.00%> (ø)
...nt/public/components/page_wrapper/page_wrapper.tsx	100.00% <100.00%> (ø)
.../public/application/components/new_theme_modal.tsx	33.33% <ø> (ø)
.../plugins/index_pattern_management/public/plugin.ts	8.00% <ø> (+0.85%)	⬆️
...ment_section/objects_table/saved_objects_table.tsx	57.03% <ø> (ø)
...c/management_section/page_wrapper/page_wrapper.tsx	100.00% <100.00%> (ø)
.../plugins/saved_objects_management/public/plugin.ts	80.00% <ø> (+8.00%)	⬆️
...gement/public/management_section/mount_section.tsx	14.28% <0.00%> (+1.78%)	⬆️

... and 710 files with indirect coverage changes

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