Merge changes from topic "am-6110a845c4f24db4810f01b6d24bdfff"

* changes:
  [automerger skipped] Merge changes from topic "b204127880_pipeline_backport_1" into sc-v2-dev am: 8693114f am: 260bae03 -s ours
  [automerger skipped] Make FeatureFlagManager Dumpable am: 4d9465b0 am: 89e49eea -s ours
  [automerger skipped] New Pipeline: Implement lifetime extension for guts am: f7ec42ff am: c0876d89 -s ours
  [automerger skipped] Add ListenerSet and use in places which currently copy-on-iterate. am: 6a9caed0 am: 93b06dea -s ours
  [automerger skipped] Populate buckets to ensure correct corner rounds on notifications am: 4ddf9d09 am: b6f9caac -s ours
  [automerger skipped] Enabled x button for clearable silent Notif[s] am: 5e6673f9 am: 8ebb9d33 -s ours
  [automerger skipped] New pipeline: Section manager is old pipeline, so don't call it for the new. am: 61499496 am: 80633cee -s ours
  [automerger skipped] Remove dismiss-rtl setters because dismiss is bidirectional am: 53f489d7 am: 6a2193ed -s ours
  [automerger skipped] New pipeline: remove non-silent section headers am: caf22938 am: 34ba6483 -s ours