DAST Scanner Profiles - Form MVC boilerplate

• Related issue: #235399 (closed)

What does this MR do?

This MR lays the groundwork for implementing the DAST Scanner Profile form by creating:

• The DastScannerProfilesController controller and a new action.
• The required route at /:namespace/:project/-/on_demand_scans/profiles/dast_scanner_profiles/new.
• A basic HAML view.
• A basic Vue app.

Note this does not require a changelog entry as this is being developed behind a feature flag.

How to test this?

• Navigate to the new page by appending its path to some project's URL:
  • /:namespace/:project/-/on_demand_scans/profiles/dast_scanner_profiles/new

Screenshots

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