Fetch organizations from lajistore

[aorin]

• Fetch organizations from lajistore instead of triplestore
• Add an endpoint for fetching organizations by multiple ids

There is already test data in store-dev

[olzraiti]

There was some discussion about how to handle this, but no decision was made

https://luomus-ict.slack.com/archives/CNKL7GM0B/p1765883907425169

[MLumme]

Will be added to kotka.