perf(fs): don't canonicalize path when opening file if --allow-all is passed

[nathanwhit]

Fixes #28702.

[Copilot]

Pull Request Overview

This PR improves performance in filesystem operations by avoiding unnecessary canonicalization when the "--allow-all" flag is passed. Key changes include:

• Adding a new public method "allows_all" in the permissions container to check for full permission grants.
• Updating synchronous and asynchronous permission check functions in ext/fs/ops.rs to skip additional checks when all permissions are granted.
• Extending the FsPermissions trait in ext/fs/lib.rs to include an "allows_all" method.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
runtime/permissions/lib.rs	Adds the "allows_all" method to check if full permissions are granted
ext/fs/ops.rs	Updates permission check functions to conditionally bypass checks
ext/fs/lib.rs	Extends the FsPermissions trait with an "allows_all" method implementation

[dsherret]

How hard is it to move the canonicalization stuff into FsPermissions::check_open? Ideally we'd only be accessing Permissions once from the OpState and then aquiring its lock once instead of now twice when not running with -A.