Fix extensions enabling and update npx execution command

[rphovley]

The Pull Request is ready

• all github actions are passing
• are changes backwards compatible?
• fixes #0
• the branch follows the naming schema issue-123-enable-x-does-not-disable-y
• the pull request has a sensible title

Intention

With this change I intend to fix enabling more than one extension and update the command for npx starting as a service to include @latest for caching issues

Review Points

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The code follows best practices

• the code is readable
• issues for follow-up tasks have been created
• there is no any type used

Notes

[github-actions]

Visit the preview URL for this PR (updated for commit 4ca755d):

https://codeclimbersio--pr235-issue-0-fix-enable-vdp1l1i4.web.app

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