fix: add event status and participant status

[SebastianKrupinski]

• Resolves: Can not accept calendar invite calendar#6819
• Required for: fix: do not add organizer as attendee and set status spreed#14664

Summary

Event status and participant status was not being set on new events.

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)

[nickvergessen]

Would be good to backport this I guess?

[SebastianKrupinski]

Would be good to backport this I guess?

Yes

[SebastianKrupinski]

/backport to stable31

[miaulalala]

CI is unhappy

[SebastianKrupinski]

CI is unhappy

Yup, I noticed. Trying a rebase

[miaulalala]

The autoloaders should be valid. Please run the autoload checker

[backportbot]

The backport to stable31 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable31
git pull origin stable31

# Create the new backport branch
git checkout -b backport/51501/stable31

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 2de6d6b9

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/51501/stable31

Error: Failed to check for changes with origin/stable31: No changes found in backport branch

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