Search API processes folderID parameter differently in Grafana 12

### What happened? Hello Grafana team, We use the folder ID parameter in the [search](https://grafana.com/docs/grafana/latest/developers/http_api/folder_dashboard_search/#search-folders-and-dashboards) endpoint to retrieve a list of dashboards for a given folder. Previously a GET call to /api/search?folderIds=X would return a list of dashboards, as expected. Since upgrading to Grafana 12 we now get a response such as the following: `[{"id":28785,"uid":"sampleuid","orgId":1,"title":"Test Folder","uri":"db/team-test","url":"/grafana/dashboards/f/sampleuid/test-folder","slug":"","type":"dash-folder","tags":[],"isStarred":false,"sortMeta":0,"isDeleted":false}] ` I.e. the endpoint now seems to return a single item list, which contains the folder itself. Appreciate that the list of parameters [here](https://grafana.com/docs/grafana/latest/developers/http_api/folder_dashboard_search/#search-folders-and-dashboards) doesn't actually include folderIds, but this current seems a bit dangerous - instead of defaulting to behaviour of an unrecognised parameter, we do actually get a "valid" result here, which is not what end users expect / has silently changed between major versions. Additionally to this, I couldn't find this folderIds change in the [what's new](https://grafana.com/docs/grafana/latest/whatsnew/) section of Grafana 12.0. I wanted to report this in case (a) this behaviour was not intentional, (b) to ask if it might be more appropriate to fail with a deprecation warning. ### What did you expect to happen? Supplying folderIds to the search endpoint to fail ### Did this work before? Yes, in v11 ### How do we reproduce it? 1. Call the GET endpoint for /api/search with parameter folderIds. This works in v11 - i.e. it will return the list of dashboards for your supplied folderId - but behaves unexpectedly in v12 (returns a single item list, with a reference to the folder itself). ### Is the bug inside a dashboard panel? _No response_ ### Environment (with versions)? Grafan…