Provide rhel9 Dockerfile for agents

[BraisVQ]

Depends on opendevstack/ods-core#1336

TEST:

• All agents successfully built with rhel9 agent base
• Test Rust agent
• Test Python agent
• Test Node agents
• Test Terraform agents
• Test Scala agent
• Test Jdk agent
• test Golang agent

We cannot build the agents in GH actions as there is no base rhel9 agent (there is no public rhel9 agent to build our agent base)

[BraisVQ]

@gerardcl I added uv to the python rhel9 variant because we could not install older puthon versions using the package manager anymore so I switched to already add uv and use it to install python instead.
I also tested and it is working fine with current Python QS

[BraisVQ]

@terra-naut @tbugfinder could you check if the rhel9 terraform agents works properly ?

[gerardcl]

@gerardcl I added uv to the python rhel9 variant because we could not install older puthon versions using the package manager anymore so I switched to already add uv and use it to install python instead. I also tested and it is working fine with current Python QS

really nice!! with Fabian we were also planning to include it at some point this year! you go some steps ahead!! hehe nice! 💯

I've added some other minor comments!