v1.2.0-rc2

This release candidate should be the same as the final v1.2.0 release.

This release candidate is suitable for implementors, but we do not recommend
shipping products based on a release candidate API due to the possibility of
incompatible changes prior to the final release. The following represents the
changes since v1.2.0-rc1:

Breaking Changes

GRPCRoute and ReferenceGrant v1alpha2 removal

As per a previous deprecation notice, in this version, both Experimental
and Standard channel YAMLs will no longer serve the v1alpha2 versions
of GRPCRoute and ReferenceGrant.

For the final release, we will provide pre-upgrade migration instructions
to cover folks who have been using the v1alpha2 versions of these objects.

• Disable v1alpha2 versions for GRPCRoute and ReferenceGrant by @youngnick in
  #3361

Documentation Changes

• Fix a number of GEP stage errors by @youngnick in
  #3359

Testing and Conformance changes

• Add conformance suite client options by @BobyMCbobs in
  #3343
• Fix conformance test race condition by @caboteria in
  #3350