[6.5.0] Proto toolchainisation cherrypicks (#20925)

Fixes: https://github.com/bazelbuild/bazel/issues/20921

List of cherrypicks:
5a24c8a3 ilist@google.com Mon Oct 9 02:27:10 2023 -0700 Support
automatic exec groups in proto_common.compile
3e1e0616 ilist@google.com Tue Oct 3 03:32:01 2023 -0700 Use proto
toolchains in cc_proto_library
8c38be32 ilist@google.com Mon Oct 2 07:08:55 2023 -0700 Use proto
toolchains in java_lite_proto_library
51970d25 ilist@google.com Mon Oct 2 07:05:16 2023 -0700 Use proto
toolchains in java_proto_library
20bc11fa ilist@google.com Mon Oct 2 06:56:47 2023 -0700 Decouple
java_lite_proto_library from java_proto_library
3b18d3fb ilist@google.com Mon Oct 2 04:11:24 2023 -0700 Refactor proto
toolchainsation support utilities
42800a82 ilist@google.com Fri Sep 22 03:04:18 2023 -0700 Use proto
compiler from proto_toolchain rule
d435c6dd ilist@google.com Thu Sep 21 07:05:40 2023 -0700 Use
proto_toolchain in proto_library
f5fb2f6a ilist@google.com Wed Sep 20 05:50:59 2023 -0700 Remove protoc
from proto_lang_toolchain rule
108ef553 ilist@google.com Tue Sep 19 08:40:00 2023 -0700 Use
MockProtoSupport.setup where protos are used
11cf1b75 ilist@google.com Sun Sep 17 21:57:54 2023 -0700 Implement
incompatible_enable_proto_toolchain_resolution