[CORTX-33755] Added Cosmetic change in etag of copyObjectResult

[shraddhaghatol]

Problem:
Observed discrepancy with AWS for CopyObject API's response.
In MGW, "etag" field was not included in ("/ /")

Resolution:
Included etag field of CopyObject API's response in ("/ /") to make it AWS compliant

Corresponding Ceph PR ceph#47527, until that is merged, we are not supposed to merge this one, as changes in RGW Common code.

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[priyanka25081999]

Looks good!

[cdeshmukh]

@shraddhaghatol Ceph PR merged ceph#47527 (comment)

[shraddhaghatol]

Ran S3-Compatibility-Test-Ceph-RGW test. It is successful with known failures.
Following is the job link - https://eos-jenkins.colo.seagate.com/job/Cortx-Automation/job/S3Server/job/S3-Compatibility-Test-Ceph-RGW/232/#showFailuresLink