[Workspace]Fix workspace assets page UI bugs

[wanglam]

Description

This PR is for fixing a bunch of UI bugs in the workspace assets page. Here are the fixed list:

• The spacing around the table and search bar should be 16px
• Remove the "Workspace" column and filter
• Add tooltip to "Refresh" icon button
• Change the label of the workspace select field to "Target workspace" and remove the field description
• Add "Close" button to the footer of the resulting message flyout
• Change "Objects" to "Assets" in the "Export" modal (all instances)
• Change "Saved objects" to "Assets" in the Import flyout
• Change "saved objects" to "assets" for the buttons

Issues Resolved

Screenshot

Global assets

Workspace assets

Testing the changes

• Clone branch code and run yarn osd bootstrap --single-version ignore
• Add below configs in config/opensearch_dashboards.yml

savedObjects.permission.enabled: true
workspace.enabled: true
uiSettings:
  overrides:
    'home:useNewHomePage': true
opensearchDashboards.dashboardAdmin.users: ['admin']

• Run yarn start --no-base-path
• Click "View all" in the "Assets" panel
• The global assets should work as screenshot above
• Enter a workspace use left navigation
• Click "View all" in the "Assets" panel
• The workspace assets page should work as screenshot above

Changelog

• fix: [Workspace]Fix workspace assets page UI bugs

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 12 lines in your changes missing coverage. Please review.

Project coverage is 60.92%. Comparing base (8691010) to head (ab399fa).
Report is 165 commits behind head on main.

Files with missing lines	Patch %	Lines
...gement/public/management_section/mount_section.tsx	25.00%	9 Missing ⚠️
...ment_section/objects_table/saved_objects_table.tsx	81.81%	1 Missing and 1 partial ⚠️
src/plugins/workspace/public/plugin.ts	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8265      +/-   ##
==========================================
- Coverage   60.92%   60.92%   -0.01%     
==========================================
  Files        3749     3749              
  Lines       89021    89033      +12     
  Branches    13899    13903       +4     
==========================================
+ Hits        54236    54240       +4     
- Misses      31423    31430       +7     
- Partials     3362     3363       +1     

Flag	Coverage Δ
Linux_1	28.85% <19.44%> (-0.01%)	⬇️
Linux_2	56.35% <ø> (ø)
Linux_3	37.75% <17.64%> (?)
Linux_4	29.94% <67.64%> (+<0.01%)	⬆️
Windows_1	28.86% <19.44%> (-0.01%)	⬇️
Windows_2	56.30% <ø> (ø)
Windows_3	37.75% <17.64%> (-0.01%)	⬇️
Windows_4	29.94% <67.64%> (+<0.01%)	⬆️

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[Hailong-am]

do we need to check new home page flag for all those wording change?

[wanglam]

This new home page flag check logic is already in line 121. I think we don't need to do it again here. This export button only displayed when new home page flag enabled.