Normalize input paths in cloud file stores to match IFileStore semantics

[moamen-0]

This PR fixes inconsistent path handling in cloud-based IFileStore implementations by normalizing input paths before they are used in comparisons and directory operations.

Problem

IFileStore defines forward slash (/) as the path delimiter. However, some cloud file store implementations (Azure Blob and AWS S3) were using the raw path parameter in string comparisons (e.g. EndsWith(path)), which could lead to incorrect behavior when callers passed Windows-style paths using backslashes (\).

For example:

"folder/subfolder".EndsWith("folder\\subfolder")==false

This could result in incorrect directory listings or filtering behavior. The issue is less visible when using FileSystemStore, as it already normalizes paths internally.

Changes

• Normalize the input path at the beginning of directory content methods to ensure consistent behavior with the IFileStore contract.
• Applied the same fix to both cloud providers to keep behavior aligned.

Specifically:

• Azure Blob
  • Normalize path in directory listing methods before performing comparisons.
• AWS S3
  • Normalize path in directory content retrieval before filtering.

Why this change is correct

• IFileStore explicitly defines / as the canonical path separator.
• Other code paths (such as Combine(...)) already normalize paths, but direct string comparisons were still using unnormalized input.
• Normalizing at the provider boundary ensures consistent, predictable behavior without affecting callers that already pass normalized paths.

Testing

• This change was not covered by automated tests because the affected providers require external cloud dependencies.
• The modification is limited to pure path normalization logic and does not alter cloud I/O behavior.
• Behavior is consistent with existing normalization patterns used elsewhere in the codebase.

If maintainers prefer extracting this logic for unit testing or adding provider-specific tests, I’m happy to update the PR accordingly.

Fixes #14328

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