feat: Add support to user-specific overrides for catalog users and components

[Fortune-Ndlovu]

Description

The wait-for-plugins-and-start.sh script now simplifies startup by:

• Copying the default app-config.yaml to generated/app-config.patched.yaml
• Replacing target: paths for users.yaml and components.yaml if corresponding override files exist
• Launching the backend using the patched config along with any optional local overrides

Which issue(s) does this PR fix or relate to

• Fixes https://issues.redhat.com/browse/RHIDP-7411

PR acceptance criteria

• Tests
• Documentation

How to test changes / Special notes to the reviewer

[Fortune-Ndlovu]

cc/ @rm3l for review, please

[rm3l]

/cc

[rm3l]

@Fortune-Ndlovu Could you please rebase your branch and fix the conflicts?

[Fortune-Ndlovu]

@rm3l I have rebased and fixed conflicts

[Fortune-Ndlovu]

Thanks @rm3l, I've made the following changes to align with the convention you recommended:

• Renamed users.override.yaml to users.override.example.yaml
• Renamed components.override.yaml to components.override.example.yaml
• Updated .gitignore to exclude the actual users.override.yaml and components.override.yaml files, ensuring only the example templates are tracked.
• Updated the README.md to instruct users to copy the example files before customizing:

cp configs/catalog-entities/users.override.example.yaml configs/catalog-entities/users.override.yaml
cp configs/catalog-entities/components.override.example.yaml configs/catalog-entities/components.override.yaml

• Updated prepare-and-install-dynamic-plugins.sh to use the new .example.yaml file paths when checking for overrides:

USERS_OVERRIDE="/opt/app-root/src/configs/catalog-entities/users.override.example.yaml"
COMPONENTS_OVERRIDE="/opt/app-root/src/configs/catalog-entities/components.override.example.yaml"

This setup ensures that example override files are tracked in Git, while actual user configs remain local and Git-ignored. It also aligns with how dynamic plugin overrides are handled

[Fortune-Ndlovu]

Thanks @rm3l for the thorough review!

[Fortune-Ndlovu]

@rm3l lgtm

[rm3l]

LGTM - thanks!

/lgtm