recordtester: Fix session checks for catalyst recording tests

[victorges]

Review with "ignore whitespace changes" so the diff is cleaner.

This fixes the record-tester behavior for catalyst recording tests:

• It expects 2 session objects instead of only 1 as before
• It allows configuring for how long it should wait for the recording to be available
  • (might wanna add some polling if we need a too high limit here)
• Default to not using forceUrl which is not supported anymore
• Tests all 2 sessions streamed instead of only the last one

[leszko]

I think the change is ok, though I didn't manage to run it successfully locally. Let's discuss more in Discord.