[Workspace]Show add collaborators modal until collaborators added

[wanglam]

Description

This PR is for updating a UX behavior when adding collaborators. The add collaborators modal will be displayed until collaborators added. The "Add collaborators" button will become disabled & loading state during the updating API call.

Screenshot

Testing the changes

• Clone branch code and run yarn osd bootstrap --single-version loose
• 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
• Login with admin user and go to an existing workspace setting page
• Click "Collaborators" tab
• Click "Add Collaborators" button
• Click "Add users" button in the dropdown
• Enter user id and click "Add Collaborators" button, the "Add Collaborators" button should be disabled & loading state

Changelog

• feat: [Workspace]Show add collaborators modal until collaborators added

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

All modified and coverable lines are covered by tests ✅

Project coverage is 60.92%. Comparing base (9cad0a3) to head (2c17beb).
Report is 72 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8574   +/-   ##
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  Coverage   60.92%   60.92%           
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  Files        3777     3777           
  Lines       89843    89847    +4     
  Branches    14083    14083           
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+ Hits        54736    54740    +4     
  Misses      31672    31672           
  Partials     3435     3435           

Flag	Coverage Δ
Linux_1	29.13% <100.00%> (+<0.01%)	⬆️
Linux_2	56.28% <ø> (ø)
Linux_3	37.81% <ø> (ø)
Linux_4	29.95% <ø> (ø)
Windows_1	29.15% <100.00%> (+<0.01%)	⬆️
Windows_2	56.23% <ø> (ø)
Windows_3	37.81% <ø> (+<0.01%)	⬆️
Windows_4	29.95% <ø> (ø)

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