Support for metadata-only fetches in k8s_info module

[fchiacchiaretta]

SUMMARY

This pull request adds support for a new metadata_only option in k8s_info module, enabling support for K8S API Metadata-only fetches.

This helps reducing memory footprint when retrieving large collections of objects.

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

k8s_info

ADDITIONAL INFORMATION

Added metadata_only option in k8s_info module, enabling support for K8S API Metadata-only fetches.

The Accept header used when metadata_only option is true also includes a fallback value application/json;q=0.9 as documented upstream, so that full objects are returned if the API doesn't support partial responses instead of an HTTP 406 error.

Added integration tests to verify the behavior of the metadata_only option.

Closes #1022

[softwarefactory-project-zuul]

Build succeeded.
https://ansible.softwarefactory-project.io/zuul/buildset/dd95e56890ec4c50900d7c62cae2d0fb

✔️ ansible-galaxy-importer SUCCESS in 3m 32s
✔️ build-ansible-collection SUCCESS in 5m 45s

[softwarefactory-project-zuul]

Build succeeded.
https://ansible.softwarefactory-project.io/zuul/buildset/3650a340f57c4657b0aa4269985573bf

✔️ ansible-galaxy-importer SUCCESS in 3m 24s
✔️ build-ansible-collection SUCCESS in 5m 45s

[softwarefactory-project-zuul]

Build succeeded.
https://ansible.softwarefactory-project.io/zuul/buildset/e4a6e2e6a4764593a34d7777f0bdb403

✔️ ansible-galaxy-importer SUCCESS in 3m 30s
✔️ build-ansible-collection SUCCESS in 5m 49s

[softwarefactory-project-zuul]

Build succeeded.
https://ansible.softwarefactory-project.io/zuul/buildset/3ce54c8f7993456da1007e0c92e6659c

✔️ ansible-galaxy-importer SUCCESS in 3m 20s
✔️ build-ansible-collection SUCCESS in 5m 49s

[fchiacchiaretta]

I pushed one last fix for linters (sorry for missing that, it didn't complain when I ran that locally), but failed sanity and integration test don't seem to be related with the changes in this PR, can you help me on this?

[softwarefactory-project-zuul]

Build succeeded.
https://ansible.softwarefactory-project.io/zuul/buildset/35c4eb8460e543218cf2de9578b83e73

✔️ ansible-galaxy-importer SUCCESS in 3m 32s
✔️ build-ansible-collection SUCCESS in 5m 51s