Align interval schedule pick list values on edit schedule and add schedule modal

[billpalombi]

First check

• [X] I added a descriptive title to this issue.
• [X] I used the GitHub search to find a similar request and didn't find it.
• [X] I searched the Prefect documentation for this feature.

Prefect Version

2.x

Describe the proposed behavior

The values in the interval pick list on the edit schedule and add schedule modal should all be left aligned, regardless of whether one is selected. Potential solutions to the current alignment issue include:

• removing the checkmark entirely, highlighting the selected value instead
• moving the check mark to the right of the selected value

Describe the current behavior

The selected value in the pick list is indented by the check mark.

Example Use

No response

Additional context

No response