feat: connect ux improvements

[Anemy]

Current changes:

• Updates how we use the data-service & connection model for new version (not yet published/pr).
• Adds slight opacity transition to the modal to make it appearing a little smoother.
• Removes the animation on the connect modal showing (looks a little nicer now with less movement - will sync with Claudia).
• Makes the svg connect illustration responsive height (max 40 view height).

Still to do:
Fix connection form connecting title (doesn't currently show port). Could do this in another pr. Existing bug in connection-model

[rose-m]

Code LGTM! I'd probably do the other change in another PR (form title)