Follow-up to #21707 with a focus on back-filling more extension type URLs. Renames extensions_build_config and extensions_metadata to the names in the internal extension registry. For preserve_case, we deprecate the short name with the fully qualified name (both names are valid in the interim).
Risk Level: medium, only preserve_case name changes
Testing: regression
Docs Changes: yes
Release Notes: yes
Signed-off-by: Kuat Yessenov <kuat@google.com>
Mirrored from https://github.com/envoyproxy/envoy @ 7c04dda02a61c4866b6cc7273c776d62dd3fb127