Fix WebDAV GetRelativePath to handle full URLs from server responses

[Copilot]

WebDAV servers return full URLs (e.g., http://server:80/root/path/file.txt) in PROPFIND responses, but GetRelativePath was only handling relative path strings, causing ListItemsAsync to fail.

Changes:

• Modified GetRelativePath to detect and parse full URLs using Uri.TryCreate
• Extract AbsolutePath component and URL-decode it before stripping root path
• Preserves existing behavior for relative path inputs

Example:

// Before: Failed on full URLs
GetRelativePath("http://webdav:80/root/list_test/file1.txt")  
// Returned: "http://webdav:80/root/list_test/file1.txt" (wrong)

// After: Correctly extracts relative path
GetRelativePath("http://webdav:80/root/list_test/file1.txt")  
// Returns: "list_test/file1.txt" (correct)

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• 127.0.0.11
  • Triggering command: REDACTED, pid is -1 (packet block)
• 8.8.8.8
  • Triggering command: REDACTED, pid is -1 (packet block)
• analytics.localstack.cloud
  • Triggering command: /opt/code/localstack/.venv/bin/python /opt/code/localstack/.venv/bin/python -m localstack.runtime.main 172.18.0.4 --dport 21 -j MASQUERADE (dns block)
  • Triggering command: /opt/code/localstack/.venv/bin/python /opt/code/localstack/.venv/bin/python -m localstack.runtime.main es --no�� --noprofile (dns block)
• api.localstack.cloud
  • Triggering command: /opt/code/localstack/.venv/bin/python /opt/code/localstack/.venv/bin/python -m localstack.runtime.main 172.18.0.4 --dport 21 -j MASQUERADE (dns block)
  • Triggering command: /opt/code/localstack/.venv/bin/python /opt/code/localstack/.venv/bin/python -m localstack.runtime.main es --no�� --noprofile (dns block)
• assets.localstack.cloud
  • Triggering command: /opt/code/localstack/.venv/bin/python /opt/code/localstack/.venv/bin/python -m localstack.runtime.main 172.18.0.4 --dport 21 -j MASQUERADE (dns block)
  • Triggering command: /opt/code/localstack/.venv/bin/python /opt/code/localstack/.venv/bin/python -m localstack.runtime.main es --no�� --noprofile (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)