Updating the 'stop all jobs' modal

What does this MR do?

Starts the process of updating app/assets/javascripts/pages/admin/jobs/index/components/stop_jobs_modal.vue to use the new Pajamas integration. However, it doesn't currently finish the job.

The following files reference stop-jobs-modal:

$ grep -riI "stop-jobs-modal" .

./app/views/admin/jobs/index.html.haml:    #stop-jobs-modal
./app/views/admin/jobs/index.html.haml:        target: '#stop-jobs-modal',
./app/assets/javascripts/pages/admin/jobs/index/index.js:      el: '#stop-jobs-modal',
./app/assets/javascripts/pages/admin/jobs/index/index.js:        return createElement('stop-jobs-modal', {
./app/assets/javascripts/pages/admin/jobs/index/components/stop_jobs_modal.vue:    modal-id="stop-jobs-modal"

app/views/admin/jobs/index.html.haml is beyond my ability to edit. This isn't a standard button, and I do not know how to edit this code:

  - if @all_builds.running_or_pending.any?
    #stop-jobs-modal
    .nav-controls
      %button#stop-jobs-button.btn.gl-button.btn-danger{ data: { toggle: 'modal',
        target: '#stop-jobs-modal',
        url: cancel_all_admin_jobs_path } }
        = s_('AdminArea|Stop all jobs')

Acknowledgment: I haven't run yarn prettier yet since I know there's more work to do.

I'm tagging in @ekigbo since that's what roulette is instructing me to do.

• Closes #229701 (closed)
• Related to &3939 (closed) (the modals epic)

Screenshots (strongly suggested)

Before	After
Screen_Recording_2020-10-27_at_11.48.39_am	Screen_Recording_2020-10-27_at_12.58.46_pm

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team

Related to #229701 (closed)