The deployment details page is mostly for managing approvals at the
moment, but a feedback banner is in place to better understand what
users might be looking for.

Changelog: added

Only expose the web path when the `deployment_details_page` feature flag
is enabled. This covers a few ways the user can make it into the
deployment details page.

For all manual deployments, we wan to make it easy for the user to run
the deployment from the details page. While we still link to the jobs
page for variable customization, we can still add an easy button to the
details page.

Details include tags associated with the deployment, the triggerer, the
external URL, the ref, and the job details.

Also moves `show_more` to vue shared.

Changelog: added

Changelog: added