check sidecarImage、mysqlVersion stay the same

[qianfen2021]

Describe the problem

check sidecarImage、mysqlVersion stay the same

To Reproduce

1.in mysqlcluster cr file，the mysqlVersion、image is empty
2.create cluster
3.mysqlVersion、image default is 5.7，but sidecarImage is 8.0

Expected behavior

Environment:

• RadonDB MySQL version:v2.3.0