Option to disable auto-recovery of cron monitor issue

### Problem Statement

Cron monitors get automatically resolved by Sentry after Recovery Tolerance consecutive healthy checkins.

Sometimes, it is preferred that cron monitor failures get manually reviewed before being resolved. This is not possible if they are resolved automatically.

### Solution Brainstorm

Make Recovery Tolerance optional. If Recovery Tolerance is not specified, do not resolve cron monitor failure issues automatically.

### Product Area

Crons