[feature] Move mysql's health check to pod.

[runkecheng]

Is your feature request related to a problem? Please describe.

Remove the MySQL checking logic in Operator

https://github.com/percona/percona-server-mysql-operator/blob/main/cmd/healthcheck/main.go

Describe the solution you'd like

Describe alternatives you've considered

Additional context

[mangoGoForward]

I'd like to work on this issue, please assign to me.