rich_media/helpers.ex: Add config to disable fetching from remote activities

Status Job ID Name Coverage
  Build
passed #96733
build

00:01:33

 
  Test
passed #96738
analysis

00:00:53

passed #96735
federated-testing

00:01:39

passed #96737
lint

00:00:24

passed #96734
unit-testing

00:02:51

87.5%
passed #96736
unit-testing-rum

00:02:34

 
  Benchmark
manual #96739
allowed to fail manual
benchmark
 
  Deploy
manual #96740
allowed to fail manual
review_app
manual #96741
allowed to fail manual
stop_review_app