CSV export fixes

[gidan80]

• Resolves: partially Export through the UI #3508
• Target version: main

Summary

Fixes CSV export: in particular escaping quotation marks and adds the "assigned user" column.

TODO

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

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[luka-nextcloud]

@gidan80 Thanks for sending the PR. Code change looks okay. Regarding escaping quotation, the card title should be handled as well.

[gidan80]

I forgot about that. Should be fine now.

[gidan80]

I see thah the linter is throwing some errors. Do i need to force-push the corrections?

[luka-nextcloud]

@gidan80 Yes, please.

[luka-nextcloud]

@gidan80 The query count was increased. Pleas update the query count in tests/integration/base-query-count.txt to 81091.

[luka-nextcloud]

Please check my comment above.