rgw_sal_motr : [CORTX-34167] Modify error code and error message of GET/HEAD object API

[priyanka25081999]

Problem Statement:
GET/HEAD Object API with version id of a delete marker gives 404 (NoSuchKey) error in the response.

Solution:
Modified the error code and error message of GET/HEAD object API response to 405 (MethodNotAllowed) in case of delete-marker.

Signed-off-by: Priyanka Salunke [email protected]

Checklist

• Tracker (select at least one)
  • References tracker ticket
  • Very recent bug; references commit where it was introduced
  • New feature (ticket optional)
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  • Code cleanup (no ticket needed)
• Component impact
  • Affects Dashboard, opened tracker ticket
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  • No impact that needs to be tracked
• Documentation (select at least one)
  • Updates relevant documentation
  • No doc update is appropriate
• Tests (select at least one)
  • Includes unit test(s)
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  • No tests

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[priyanka25081999]

1N k8s auto-triggered deployment is successful - https://eos-jenkins.colo.seagate.com/job/Cortx-PR-Build/job/Cortx-Deployment/job/Generic/job/cortx-rgw/208/

[priyanka25081999]

Sanity is successful - https://eos-jenkins.colo.seagate.com/job/Cortx-Automation/job/S3Server/job/S3-Compatibility-Test-Ceph-RGW/237/ [PASSED]