Update package details UI to be Vue

What does this MR do?

This update changes the packages detail page to use Vue instead of Haml. This is in anticipation of the new Conan support coming in #8248 (closed) which requires some more interactive UI elements.

This MR specifically changes the details view from Vue to Haml in a like for like manner (i.e. there are no new features or UI changes between the two versions, except for usage of an updated modal, see below.). This is the first step before these changes are further updated to support new Conan UI elements and features (one being an expandable list).

Screenshots

NPM Package:

Maven Package:

New Deletion Modal:

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance 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

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