fix: due date events in activity logging

[luka-nextcloud]

• Resolves: Activity log is flooded with "You have updated the due date..." when edit the card description #7142
• Target version: main

Summary

Prevents unnecessary activity events from being triggered if the duedate field's value has not actually changed

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Documentation (manuals or wiki) has been updated or is not required

[github-actions]

🐢 Performance warning.
It looks like the query count of the integration tests increased with this PR.
Database query count is now 210083 was 198420 (+5.87%)
Please check your code again. If you added a new test this can be expected and the base value in tests/integration/base-query-count.txt can be increased.

[luka-nextcloud]

/backport to stable33

[luka-nextcloud]

/backport to stable34

[luka-nextcloud]

/backport to stable35

[luka-nextcloud]

/backport to stable35

[backportbot]

The backport to stable35 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable35
git pull origin stable35

# Create the new backport branch
git checkout -b backport/8402/stable35

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 6990cda1 39c159e9

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/8402/stable35

Error: Failed to check for changes with origin/stable35: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[luka-nextcloud]

/backport to stable35

[backportbot]

The backport to stable35 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable35
git pull origin stable35

# Create the new backport branch
git checkout -b backport/8402/stable35

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 6990cda1 39c159e9

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/8402/stable35

Error: Failed to check for changes with origin/stable35: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.