[create_timepoint] Add error swal

[victori444]

Brief summary of changes

In the Create Timepoint module, if there was a PHP error upon submission, the entered data would not save without any error message. This adds an error swal if a PHP error occurs

Testing instructions (if applicable)

1. Revert the changes made in this PR to cause a PHP error
2. In the Create Timepoint module of any candidate, create a new valid visit
3. Submit and verify that the error swal appears
4. Restore the changes in the create_timepoint class (such that there are no PHP errors) and check that new visits can be created

Link(s) to related issue(s)

• Resolves #9358

[driusan]

I'm trying to test this but I'm still getting a success swal.

[racostas]

In conclusion, when we got a PHP error, the swal is not showing it so the PR still need work since this was the goal