Remove UseContainerSupport from JAVA_OPS

[megian]

As it is default in OpenJDK17 since Keycloak v21.

Ref: https://github.com/keycloak/keycloak/blob/release/21.0/quarkus/container/Dockerfile#L20

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  The PR has a meaningful description that sums up the change. It will be
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[megian]

Memory footprint before:

Total memory
    247 MB
Free memory
    191 MB
Used memory
    56 MB

[megian]

Memory footprint after:

Total memory
    247 MB
Free memory
    199 MB
Used memory
    47 MB