Merge `staging` into `prod`

[jimlerza]

Includes

Ticket/Task	Type	Other Contributors	PR Made By
flexion#10476	story		@Mwindo #5361
devex	devex		@TomElliottFlexion #5357
flexion#10470 flexion#10468	design debt		@akuny #5355
flexion#10282	design debt		@akuny #5354
opex	devex		@Mwindo #5349
opex	devex		@jimlerza #5340
dependencies	dependencies		@zachrog #5336 @zachrog #5342
flexion#10401	bugfix		@cruzjone-flexion #5316
flexion#10437	story	@cruzjone-flexion	@zachrog #5306
devex	devex		@TomElliottFlexion #5301
flexion#10339	story	@nechama-krigsman	@TomElliottFlexion #5246
opex	devex	@jimlerza	@jtdevos #5180

Manual steps

• [x] Deploy docker container 4.3.9 to the production ECR:

  . ustc-env prod
  DESTINATION_TAG=4.3.9 ./docker-to-ecr.sh