feat: devWorkspaces: Add link to dashboard, implement stop

[benoitf]

What does this PR do?

• Add a link to dashboard in command palette for DevWorkspace mode
• Implement the stopWorkspace method (instead of current throwing 'not implemented' error) of a DevWorkspace
• Redirect to the dashboard page when closing the Workspace in DevWorkspace mode (today it's doing nothing. workspace is not stopped and we stay in the IDE page)

Screenshot/screencast of this PR

What issues does this PR fix or reference?

Fixes eclipse-che/che#20808

How to test this PR?

In DevWorkspace mode:
open a getting started, check there is a link in command palette to open dashboard and you can open dashboard
close the workspace and check we're redirected to dashboard
you can try with:
https://<che-host-with-devworkspace>#https://github.com/che-samples/java-spring-petclinic/tree/devfilev2?che-editor=https://gist.githubusercontent.com/benoitf/8603992a73e902792b8961c645395897/raw/619f4ae4b29dfdb27e016e73353715050c75d4f1/pr1264-theia.yaml

in che-server-mode:
check open dashboard command is NOT in command palette (it's only for DevWorkspace mode)
Try to use menu "close workspace", it should display again the workspaces as before (we stay in dashboard)

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated
• Optional Companion PR for updating the HappyPath tests is approved and ready to be merged

Reviewers

Reviewers, please comment how you tested the PR when approving it.

Happy Path Channel

HAPPY_PATH_CHANNEL=next

Change-Id: I55672c6ed1b8933e921d85f8bcb956f127680cf6
Signed-off-by: Florent Benoit fbenoit@redhat.com

[che-bot]

✅ E2E Happy path tests succeed 🎉

See Details

• Jenkins job

• test report

• logs and configs

• Happy path tests DevFile

• images:

name	link
che-theia	quay.io/crw_pr/che-theia:1264
che-theia-endpoint-runtime-binary	quay.io/crw_pr/che-theia-endpoint-runtime-binary:1264

Test product:

• tested with Eclipse Che on K8S (minikube v1.22.0)
• E2E test scenario
• E2E test pipeline source code

• Use comment "[crw-ci-test]" to rerun happy path E2E test.
• Use comment "[crw-ci-test --rebuild]" to re-build the images and rerun happy path E2E test.

Eclipse Che QE channel: https://mattermost.eclipse.org/eclipse/channels/eclipse-che-qe