Add dropdown option and display elements

[mehulkaklotar]

There will be a dropdown list of plugins installed on the site with a submit button to trigger checks for the plugin.

Page form options

Acceptance Criteria

• In the Admin class, we need to use the get_plugins function to get a list of all the activated plugins, exclude plugin check from it and show it in the dropdown. Admin class will be added in the Create Tools page #32

Tests Coverage

• Verify the dropdown plugin list with the actual plugin list.
• Verify the dropdown template's markup with the actual markup we expected.

[vishalkakadiya]

@jjgrainger updated this epic. Can you review this before sending it to Felix? Thank you!

[jjgrainger]

Thanks @vishalkakadiya

See my comment on #32 (comment).

I think we should combine this issue with #32 and close this one.

[vishalkakadiya]

@jjgrainger I have added the details on #32, so we can close this now. Thank you!

[felixarntz]

Closing this as it is now covered in #32, to avoid confusion.