InfluxDB 2.3 -> 2.7 : Slow start time caused by number of checks

# InfluxDB 2.3 -> 2.7 : Slow start time caused by number of checks
## The issue
I recently migrated from Docker image influx:2.3 to influx:2.7.

I never had issue with the start time of 2.3. After migrating to 2.7, start time would increase from a couple seconds (2-3 seconds) to more than 10 minutes.

After investigation, I found out that the start time in 2.7 is directly proportional to number of Checks which is not the case in 2.3

## Step to reproduce
1. Add many checks (>100)
2. Wait a couple hours. (Problem does not arise immediately after check creation)
3. Restart Influx container
4. Notice the slow start time
5. Remove all checks
6. Restart Influx container
7. Notice almost immediate start time

*note: by start time I mean the time between the container creation and Influx tcp-listener start

Reproduce the startup behavior with the influx:2.3 and influx:2.7 Docker images, using more than 100 checks and waiting before restarting the container. Compare the time until the Influx TCP listener starts; done means startup no longer increases substantially with the number of checks.

Written by the indexing model from the issue text.