Share only the conversation link without extra text

[jancborchardt]

When sharing the conversation link, it always has some extra text at the beginning:

Join conversation [conversation name] at [conversation link]

This text is not needed, and only the conversation link should be shared/copied.

Especially since nowadays most places where you paste things (like chat apps and text editors) will show a preview of the link anyway.

Handles both the "Share link" action in the long-press menu of the conversation list as well as "Share conversation link" in the "Conversation settings".

🖼️ Screenshots

N/A

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included or not needed
• 🔖 Capability is checked or not needed
• 🔙 Backport requests are created or not needed: /backport to stable-xx.x
• 📅 Milestone is set
• 🌸 PR title is meaningful (if it should be in the changelog: is it meaningful to users?)

🤖 AI (if applicable)

• The content of this PR was partly or fully generated using AI

[github-actions]

APK file: https://github.com/nextcloud/talk-android/actions/runs/28377765741/artifacts/7954407216
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[jancborchardt]

Fixed (relevant) tests and linters. :)

[github-actions]

APK file: https://github.com/nextcloud/talk-android/actions/runs/28445619559/artifacts/7981586929
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[github-actions]

APK file: https://github.com/nextcloud/talk-android/actions/runs/28472967746/artifacts/7992611717
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[github-actions]

APK file: https://github.com/nextcloud/talk-android/actions/runs/29011957715/artifacts/8196485422
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)