NSFS | Regular object key & dir content object overriding

[naveenpaul1]

Explain the changes

1. PR will handle Key and Key/ overriding, object obj1 overriding with obj1/ should not fail and vice versa

• unlink the file obj1 when try to override with dir obj1/ to avoid Not a directory error
• delete the folder obj1/ when try to override with file obj1 to avoid error InternalError
  normal override(object1 overrides object1 or dir1/ overrides dir1/) will not delete the file/folder

Issues: Fixed #xxx / Gap #xxx

1. NSFS | Regular object key & dir content object - key/ co-existence and overriding #8320

Testing Instructions:

1. Please refer test in issue NSFS | Regular object key & dir content object - key/ co-existence and overriding #8320
2. when obj1 override with obj1/ dir, a new folder should be created with the name obj1/
3. when obj1/ dir override with key obj1, a new file should be created with the name obj1
4. object1 overrides object1 and dir1/ overrides dir1/ should not delete the respective file/folder

• Doc added/updated
• Tests added

[naveenpaul1]

These changes wont work with versioning, Need to update the code once versioning changes are merged. PR Blocked