feat: Add setup checks and verify WOPI connectivity

[juliusknorr]

• Add a setup check to verify that we are running the latest Collabora release
• Add a setup check to verify connectivity with the collabora server
• Extend the connectivity checks with using the new Collabora endpoint to verify WOPI access (that Collabora can reach Nextcloud)

Needs CollaboraOnline/online#11162 for self-signed certificates that are not trusted on Collabora (without validation)

[juliusknorr]

@meven I'm struggling to get CI passing as when the check runs Collabora returns an UnspecifiedError, however the status code is a 200 as far as I see in the logs.

Do you have any clue why that is not passing?

wsd-00001-00032 2025-03-20 21:32:08.932036 +0000 [ websrv_poll ] DBG  #30: Handling request: /hosting/wopiAccessCheck, closeConnection false| wsd/ClientRequestDispatcher.cpp:700
  wsd-00001-00032 2025-03-20 21:32:08.932046 +0000 [ websrv_poll ] DBG  #30: Wopi Access Check request: /hosting/wopiAccessCheck| wsd/ClientRequestDispatcher.cpp:1140
  wsd-00001-00032 2025-03-20 21:32:08.932087 +0000 [ websrv_poll ] DBG  Connecting to 172.17.0.1:8081 (Unencrypted)| net/NetUtil.cpp:458
  wsd-00001-00032 2025-03-20 21:32:08.932105 +0000 [ websrv_poll ] DBG  #-1: starting asyncRequest: GET 172.17.0.1:8081 /status.php| net/HttpRequest.hpp:1340
  wsd-00001-00032 2025-03-20 21:32:08.932112 +0000 [ websrv_poll ] DBG  #30: Handled request: /hosting/wopiAccessCheck, inBuf[sz 231 -> 54, rm 177], connection open true| wsd/ClientRequestDispatcher.cpp:994
  wsd-00001-00022 2025-03-20 21:32:08.932537 +0000 [ asyncdns ] DBG  #31: Created socket. Thread affinity set to 0x7fd3450006c0, Socket[#31, IPv4 @ :0]| net/Socket.hpp:474
  wsd-00001-00022 2025-03-20 21:32:08.932558 +0000 [ asyncdns ] DBG  #31 New socket connected to 172.17.0.1:8081 (Unencrypted)| net/NetUtil.cpp:517
  wsd-00001-00032 2025-03-20 21:32:09.116401 +0000 [ websrv_poll ] DBG  #31: Closed after reading. Read result: 0 errno: 0| net/Socket.hpp:1515
  wsd-00001-00032 2025-03-20 21:32:09.116470 +0000 [ websrv_poll ] DBG  #30: Wopi Access Check: got response state: State::Error , response status code: 200 (OK) , last errno: 0| wsd/ClientRequestDispatcher.cpp:1316
  wsd-00001-00032 2025-03-20 21:32:09.116522 +0000 [ websrv_poll ] INF  #30: Wopi Access Check request, result: UnspecifiedError| wsd/ClientRequestDispatcher.cpp:1226
  wsd-00001-00032 2025-03-20 21:32:09.116552 +0000 [ websrv_poll ] DBG  #31: Closed socket Socket[#31, IPv4 @ :0]| net/Socket.hpp:171
  wsd-00001-00032 2025-03-20 21:32:09.116588 +0000 [ websrv_poll ] DBG  #30: Closed socket Socket[#30, IPv6 @ ::ffff:172.18.0.1:64643]| net/Socket.hpp:171