Suppress requireAmpResponseSourceOrigin error message when ampCors=fa…

…lse. (ampproject#6784)

Eliminate useless The play() request was interrupted by a call to pau…

…se() errors from being logged (ampproject#6680)

* Eliminate useless The play() request was interrupted by a call to pause() errors from being logged

* Eliminate useless The play() request was interrupted by a call to pause() errors from being logged

Turn forced transfer-layer for side-bar temporarily (ampproject#6700)

Revert "make use of native IntersectionObserver in 3p iframe (ampproj…

…ect#6503)" (ampproject#6685)

This reverts commit 7ff2657.

Hide amp-app-banner with a warning on iOS for temp fix (ampproject#6669)

Revert "Lazily allocate observables" (ampproject#6650)

Fix Sidebar navigations being cancelled. (ampproject#6590)

Fix Sidebar navigations being cancelled. (ampproject#6590)

App-Banner: Do not use Array#find (ampproject#6567)

Also changes a few user errors to report to the user.

fix amp-accordion: always return non-null sessionState (ampproject#6488)

* check for null

* use ?

* tighten type check