Replace import confirmation modal with hover message

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Problem to solve

Based on the conversation in !80434 (comment 839581269), as a follow-up #344559 (closed) and #344558 (closed) we should replace the confirmation modal used to inform user's about how to enable various import methods.

Currently the import bitbucket and import from gitlab buttons are available under the right conditions, clicking the button results in a modal popping up to provide instructions on how to enable the features.

Before MR	Current appearance

Proposal

We should:

• Display the buttons in a disabled state when the features need to be enabled
• Provide a popover with the relevant link to the help information
• Is it possible to standardize the import interaction UI when clicking the various buttons moved to #353522
• Add additional specs for the bitbucket button: !80434 (comment 842295015)

Related to #344559 (closed) and #344558 (closed)