[PR #2083/9c53b6c1 backport][stable-8] backup_plan_info: bugfix to enable getting info of all backup plans

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This is a backport of PR #2083 as merged into main (9c53b6c12e9c3e043f695b9791bfd499a770062a).

SUMMARY

Fix being unable to fetch info of all backup plans. With backup_plan_names being a required parameter, the functionality to get all plans info was not working

# Gather information about all backup plans
- name: Get info of all backup plans 
  amazon.aws.backup_plan_info:
  register: plan_info_result

gave
**********
fatal: [localhost]: FAILED! => {"changed": false, "msg": "missing required arguments: backup_plan_names"}

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

backup_plan_info

ADDITIONAL INFORMATION

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Build succeeded. https://ansible.softwarefactory-project.io/zuul/buildset/235ce0af6e654aa0b7baf63db774c587

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:heavy_check_mark: ansible-galaxy-importer SUCCESS in 5m 41s :heavy_check_mark: build-ansible-collection SUCCESS in 15m 46s :heavy_check_mark: ansible-test-splitter SUCCESS in 6m 59s :heavy_check_mark: integration-amazon.aws-1 SUCCESS in 7m 58s Skipped 43 jobs