[FE] Ability to change default execution interval

User story:
When I go to STT Checks list I want to modify the default (defined in the Check file) execution interval so I can control the execution of every individual STT check file

UI/UX:

See figma design: https://www.figma.com/file/uyALGCGfrcgXEp6y4oqqir/STT-Redesign?node-id=0%3A1

Acceptance criteria

• User able to modify Execution interval from current to another one
• Changes are preserved by check file name. if the name changes - it's on default (specified in the check file) interval

Out of scope:
TBD

Suggested implementation:
Add a new API endpoint to change check intervals

How to test:
TBD

Details:
TBD