all: upgrade Envoy source to v3alpha API. #9546
Merged
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This is the mega-upgrade patch taking Envoy from v2 to v3alpha internally. It consists of a mechanically generated upgrade patch ("Mechanical upgrade via api_boost.py.") and some post-upgrade manual fixups.
Risk level: Very high. It's possible that internal changes might manifest on the wire in unanticipated ways, e.g. via type URLs or config rejection.
Testing: All tests pass.
Fixes #8082