fix(group): pass previous display name in GroupChangedEvent

[mosi-kha]

Summary

GroupChangedEvent old value was empty string,

TODO

• fix: now passes previous display name,

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

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

[mosi-kha]

Hi
if possible, backport it into stable32.
thanks

[artonge]

Makes sense.

In which context do you need that information?

[mosi-kha]

Makes sense.

In which context do you need that information?

Thanks for the approval.
I’m handling group change events and needed access to both the old and new values for additional processing. Since the old value was not included in the event, I introduced a patch to provide it.

[welcome]

Thanks for your first pull request and welcome to the community! Feel free to keep them coming! If you are looking for issues to tackle then have a look at this selection: https://github.com/nextcloud/server/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22

[mosi-kha]

@artonge
Thanks for merge
Can you backport it with stable32 too?

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