chore: Update Druid product version to 31.0.1 and adjust coordinator memory limit

[dervoeti]

Description

Part of stackabletech/docker-images#965

I had to increase the memory limit of the coordinator and middlemanager, otherwise the authorization integration test fails because the Pods get OOMKilled (happens on my local machine and on Replicated).

I also had to adapt the authorization integration test to support druid-opa-authorizer 0.6.0 (introduced by stackabletech/docker-images#984).

Definition of Done Checklist

• Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant
• Please make sure all these things are done and tick the boxes

# Author
- [x] Changes are OpenShift compatible
- [x] Helm chart can be installed and deployed operator works
- [x] Integration tests passed (for non trivial changes)
- [x] Changes need to be "offline" compatible

# Reviewer
- [ ] Code contains useful comments
- [ ] Code contains useful logging statements
- [ ] (Integration-)Test cases added
- [ ] Documentation added or updated. Follows the [style guide](https://docs.stackable.tech/home/nightly/contributor/docs/style-guide).
- [ ] Changelog updated
- [ ] Cargo.toml only contains references to git tags (not specific commits or branches)

# Acceptance
- [ ] Feature Tracker has been updated
- [ ] Proper release label has been added
- [ ] [Roadmap](https://github.com/orgs/stackabletech/projects/25/views/1) has been updated

[dervoeti]

Just noting that this is blocking stackabletech/docker-images#969

Oh, right. And since this PR, or rather all Druid 31.0.1 PRs, are blocked by this decision and it might take a while, I removed the OPA bump from this PR (was not really necessary anyway, but I thought this PR would be a quick one). I'll open a separate PR for the OPA bump.

[sbernauer]

Thanks! Please also update https://docs.stackable.tech/home/stable/druid/usage-guide/resources-and-storage/

Fun fact: @NickLarsenNZ also just chatted me about increasing the memory default ;)

[dervoeti]

Thanks! Please also update https://docs.stackable.tech/home/stable/druid/usage-guide/resources-and-storage/

Fun fact: @NickLarsenNZ also just chatted me about increasing the memory default ;)

Done 🙂

[sbernauer]

Otherwise LGTM. Let's get this in before #693