Replace passing warnings to exit_json with AnsibleModule.warn for the few modules

[yurnov]

SUMMARY

Using exit_json or fail_json for warnings is deprecated in ansible-core>=2.19.0 and will be removed in ansible-core>=2.23.0

Tested with ansible-core 2.19.3 as the latest released version at the time of commit and with 2.16.0 as the lowest version supported by kubernetes.core 6.x

Resolves: #1031

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

k8s_drain
k8s_rollback
k8s_scale

ADDITIONAL INFORMATION

The initial version of this PR covers only the module k8s_drain, with the following commits extended to k8s_rollback
k8s_scale

[softwarefactory-project-zuul]

Build succeeded.
https://ansible.softwarefactory-project.io/zuul/buildset/9a793a5db1d44322a49c4c73609d19b5

✔️ ansible-galaxy-importer SUCCESS in 3m 29s
✔️ build-ansible-collection SUCCESS in 5m 48s

[yurnov]

Unclear why I got the following in linter, but it's not related to my commit/PR:

Error: : Unable to parse documentation in python file 'plugins/modules/k8s_exec.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/k8s_scale.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/k8s_json_patch.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/lookup/kustomize.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/k8s_service.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/k8s_taint.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/connection/kubectl.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/k8s_cluster_info.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/helm_plugin_info.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/lookup/k8s.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/helm_info.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/k8s_log.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/helm_registry_auth.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/k8s.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/k8s_drain.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/helm_template.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/helm_pull.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/k8s_cp.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/helm.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/k8s_rollback.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/helm_plugin.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/helm_repository.py': The `src` field must be an absolute path..
Error: : Unable to parse documentation in python file 'plugins/modules/k8s_info.py': The `src` field must be an absolute path..

[softwarefactory-project-zuul]

Build succeeded.
https://ansible.softwarefactory-project.io/zuul/buildset/ac4d83f307604615856ab6ef88b58f3e

✔️ ansible-galaxy-importer SUCCESS in 3m 49s
✔️ build-ansible-collection SUCCESS in 6m 03s

[softwarefactory-project-zuul]

Build succeeded.
https://ansible.softwarefactory-project.io/zuul/buildset/87ec78c59fc44b019b3aee976fda6b77

✔️ ansible-galaxy-importer SUCCESS in 3m 39s
✔️ build-ansible-collection SUCCESS in 5m 47s

[softwarefactory-project-zuul]

Build succeeded.
https://ansible.softwarefactory-project.io/zuul/buildset/7ebc77176f464437ab26b39dd540b2bc

✔️ ansible-galaxy-importer SUCCESS in 3m 27s
✔️ build-ansible-collection SUCCESS in 5m 48s

[softwarefactory-project-zuul]

Build succeeded.
https://ansible.softwarefactory-project.io/zuul/buildset/4238cebd8c77432cbea88c88c19258ab

✔️ ansible-galaxy-importer SUCCESS in 3m 29s
✔️ build-ansible-collection SUCCESS in 5m 47s

[softwarefactory-project-zuul]

Build succeeded.
https://ansible.softwarefactory-project.io/zuul/buildset/a1ccf5ded70e4cd1ae5277f163fbe591

✔️ ansible-galaxy-importer SUCCESS in 3m 31s
✔️ build-ansible-collection SUCCESS in 6m 15s