HPCC-29482 WsDfs should pass user to DFS::getFileTree

[jakesmith]

When performing a ~remote file lookup, the WsDfs service looks up the logical file in Dali (via
IDistributedFileDirectory::getFileTree).
It should pass the active esp context user, but passes null. This can cause access denials.

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Testing:

[github-actions]

Jira Issue: https://hpccsystems.atlassian.net//browse/HPCC-29482

Jirabot Action Result:
Workflow Transition: Merge Pending
Updated PR
Changing assignee from: [email protected] to: [email protected]

[jakesmith]

@ghalliday - now tested. Please review