add http client request_fulluri option only if a proxy configured

[karakayasemi]

Description

We have added the HTTP client request_fulluri option to all DAV requests with #34101 when fixing federated shares behind proxy servers.

According to https://www.php.net/manual/en/context.http.php, http request_fulluri option only needed when a proxy configured and some webdav service providers are not able to respond properly when this option set without proxy. This pr adds HTTP client request_fulluri option only if a proxy configured.

Related Issue

• Fixes https://github.com/owncloud/enterprise/issues/4522

Motivation and Context

Solving bugs.

How Has This Been Tested?

Manually tested by sharing a federated share from nextcloud to owncloud. ownCloud user is able to download the share after this change.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:
• Changelog item, see TEMPLATE

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

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