[Workspace] Add workspaceAvailability field into application

[SuZhou-Joe]

Description

Home page, as well as workspace create page / workspace list page, which is supposed to be only visited out of any workspace, now is enabled to be accessed by clicking the home icon or enter the url manually in the browser.

This PR introduces a new field workspaceAvailability inside App, which indicates the availability of the application based on workspace. This field can bring two benefits:

1. When navigate between apps, plugins and core application are using the navigateToApp method. By using the workspaceAvailability field, workspace is able to do the hard navigation in a central place.
2. The workspaceAvailability field can be used in workspace create page to filter applications that should not be visible inside workspace. For now we filter out home overview page and all the pages under management section by hard code, which is not elegant and not extensible.

Issues Resolved

closes #6362

Screenshot

1. Clicking home icon will exist workspace.

2. Apps with workspaceAvailability.outOfWorkspace is inaccessible within workspace

Testing the changes

• Using the branch to bootstrap
• enabled workspace.enabled to true
• Start OSD by using yarn start --no-base-path to make sure no random base path will be appended
• Navigate to devTools
• Insert test workspaces by calling

PUT .kibana/_doc/workspace:foo
{
  "type": "workspace",
  "workspace": {
    "name": "foo"
  }
}

• Visit the homepage inside workspace: http://localhost:5601/w/foo/app/home
• You will find an error page will be found saying the application can not be found.
• Go into a page within workspace http://localhost:5601/w/foo/app/workspace_update
• Clicking the home icon in the top navigation
• You will you being navigated to home page out of workspace.

Changelog

• feat: [Workspace] Allow making apps available in workspaces using workspaceAvailability

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

[SuZhou-Joe]

@AMoo-Miki Would you mind taking a look on this PR?

[ruanyl]

LGTM, just please make sure it works as expected when workspace is turned off.