Following BAM-25490: Add Java 8u121 as the minimum supported version in Bamboo 9.2 (fixed in Bamboo 9.2.8), it is also necessary to add the same check on the Bamboo Remote/Ephemeral/Elastic Agents.

Implement Java version check on AgentBootstrap as it is used as a common Agent bootstrap entrypoint.

It may be necessary to reorganise modules to avoid circular dependencies.

Note: New Agent installations will control the compatible Java versions via wrapper.conf. In old Agents whose wrapper configuration was not adjusted correctly, unsupported Java versions may still be allowed an create unexpected errors. This is what this Feature Request prevents from happening.