Add change log for unavailability of OM container images

[viveksinghggits]

Summary

Some of the versions of ops manager container images are not built/published by us, because of an issue that we have been facing while updating the OM version in our project.
Those issues are fixed and like suggested here this PR adds change log to inform users that some version of this image are unavailable.

Proof of Work

NA

[github-actions]

⚠️ (this preview might not be accurate if the PR is not rebased on current master branch)

MCK 1.3.0 Release Notes

Bug Fixes

• This change fixes the current complex and difficult-to-maintain architecture for stateful set containers, which relies on an "agent matrix" to map operator and agent versions which led to a sheer amount of images.
• We solve this by shifting to a 3-container setup. This new design eliminates the need for the operator-version/agent-version matrix by adding one additional container containing all required binaries. This architecture maps to what we already do with the mongodb-database container.

Other Changes

• Optional permissions for PersistentVolumeClaim moved to a separate role. When managing the operator with Helm it is possible to disable permissions for PersistentVolumeClaim resources by setting operator.enablePVCResize value to false (true by default). When enabled, previously these permissions were part of the primary operator role. With this change, permissions have a separate role.
• subresourceEnabled Helm value was removed. This setting used to be true by default and made it possible to exclude subresource permissions from the operator role by specifying false as the value. We are removing this configuration option, making the operator roles always have subresource permissions. This setting was introduced as a temporary solution for this OpenShift issue. The issue has since been resolved and the setting is no longer needed.
• Container images for OpsManager versions 7.0.16, 8.0.0, 8.0.9 and 8.0.10 are not published because of a technical issue encountered in our build process.

[MaciejKaras]

LGTM