Remove AMQ 6 samples from OCP 4

[yselkowitz]

AMQ 6 is only supported on OCP 3.11: https://access.redhat.com/articles/310613

This negates the need for jboss-openshift/application-templates#501

/assign @fbm3307

[fbm3307]

/lgtm

[fbm3307]

/lgtm

[openshift-ci]

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fbm3307, yselkowitz

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [fbm3307]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[openshift-ci]

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