This change adds some files to EXTRA_DIST in Makefile.am so that our
published tar and zip files will have everything needed for Bazel
builds. I also added a basic test for this so that next time we should
find out sooner if we're missing any important files.

This should fix #9129.

This commit removes the use of bind() since that function goes against
Bazel best practices:
https://docs.bazel.build/versions/main/external.html#repository-rules-1
The bind() function basically maps a dependency into //external, but
there is no good reason to do this. By mapping dependencies into
//external and relying on this in our own BUILD files, we're forcing
projects that depend on us to do the same. The one bind() call that I
did leave in place was //:python_headers. This one seems to be doing
something complicated I don't fully understand, and I don't want to risk
breaking it.

This change also moves our list of required Maven artifacts into a
constant in protobuf_deps.bzl. This way, projects that depend on us can
refer to this list when they invoke maven_install() and automatically
pull in all the necesary dependencies.

This fixes #9132.

…obal object (#9156)

If the line above raises an exception, the upb_arena is lost and memory
is leaked.

I also updated CHANGES.txt to include a couple things I forgot to add
for 3.19.0.

Cherry-pick fixes for 3.19.1 and update change log