Remove source and destination verification when creating a connection

[tuliren]

Tell us about the problem you're trying to solve

• Before a connection is created, the web application will verify that both the source and the destination work. However, this verification process is redundant, since the verification is already done when setting up a source or destination.

Describe the solution you’d like

• Remove the verification process when creating a connection.
• Note that the verification is still necessary when creating a source or destination.

Describe the alternative you’ve considered or used

• Cache the verification result for X days, and only do that when the result is considered stale.

Additional context

• Related files: CreationFormPage.tsx, CreateEntityView.tsx.

Are you willing to submit a PR?

Yes.