BBB: warn participants in recorded conferences
BBB: warn participants in recorded conferences

fixes CNVS-8286

test plan:
  * enable the Big Blue Button plugin
  * create a BBB conference with recording enabled
  * enter the conference
  * verify that the chat log shows a recording warning

Change-Id: Idd0c98dcf1f3913e390b79579e4a3b42ddd01e86
Reviewed-on: https://gerrit.instructure.com/27605
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Matt Fairbourn <5f353e1c97bb9cc046b9db20beca0b9392f6f1b2@instructure.com>
Reviewed-by: Zach Pendleton <514dbb4d54d4f29e454990df7d075678f43f92aa@instructure.com>
Product-Review: Braden Anderson <a6cc2cef7d25f27847876bdb81651755fcebacf0@instructure.com>

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