Introduce Interface changes to Support atomic conditional-writes

[x-INFiN1TY-x]

Please describe the end goal of this project

Problem Statement

The current BlobContainer interface lacks support for atomic conditional writes, making it impossible to prevent:

1. Stale-primary scenarios in remote-store clusters
2. Concurrent write conflicts across nodes

This forces clusters to use expensive cross-node validation calls instead of leveraging native cloud storage capabilities.

Supporting References

Related Issues

• Parent Meta Issue: #17859
• RFC: RFC #17763

Issues

#18064

Related component

Storage:Remote

[krisfreedain]

Catch All Triage - 1 2