Add user profile picture boolean to capabilities

[pascalwengerter]

Description

Adds another boolean to the capabilities

Related Issue

• Fixes Communicate capability of showing user avatar images #38708

Motivation and Context

Needed for the new web frontend to know whether to fetch&render avatar profile pictures

Please review with care, I'm not a PHP dev!

[CLAassistant]

All committers have signed the CLA.

[phil-davis]

We usually add new capabilites to https://github.com/owncloud/core/blob/master/tests/acceptance/features/apiCapabilities/capabilities.feature test scenarios, similar to the way it is done at line 107.

Do you want me to add?

[pascalwengerter]

:x

We usually add new capabilites to https://github.com/owncloud/core/blob/master/tests/acceptance/features/apiCapabilities/capabilities.feature test scenarios, similar to the way it is done at line 107.

Do you want me to add?

Great idea @phil-davis , please go ahead and do so (this will also restart the pipeline which should actually pass, timed out on the last run)

[JammingBen]

LGTM code-wise 👍 Just the PR-link in the changelog

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

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