chore(stackable-operator): Separate some developer docs from CRD descriptions

[NickLarsenNZ]

The audience for doc-comments are quite different to those for the hosted CRD docs, so we should override CRD descriptions when they contain developer-level details.

Note

There are likely more changes required, but these are the few I noticed when bumping stackable-operator for druid-operator.

Description

Please add a description here. This will become the commit message of the merge request later.

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 - [ ] Changes are OpenShift compatible - [ ] CRD changes approved - [ ] Integration tests passed (for non trivial changes) 

# Reviewer - [ ] Code contains useful comments - [ ] (Integration-)Test cases added - [ ] Documentation added or updated - [ ] 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 

[NickLarsenNZ]

It passes locally:

❯ pre-commit run --from-ref origin/main --to-ref HEAD trim trailing whitespace.................................................Passed fix end of files.........................................................Passed detect aws credentials...................................................Passed detect private key.......................................................Passed clippy...................................................................Passed yamllint.............................................(no files to check)Skipped markdownlint.........................................(no files to check)Skipped ShellCheck v0.10.0...................................(no files to check)Skipped Lint GitHub Actions workflow files...................(no files to check)Skipped Lint Dockerfiles.....................................(no files to check)Skipped .scripts/verify-crate-versions...........................................Passed rustfmt..................................................................Passed