Remove use of protobuf debug APIs in test assertions to fix breaking change #2873

Job	Run time
env-protect-setup	7s
authorize	3s
get-dev-image / get-image	5s
clang-tidy	22m 33s
generate-matrix	2m 52s
code-coverage	0s
build-and-test (Go race detector, nokvm, --config=go_race --compilation_mode=opt, bazel_buildable...	2m 29s
build-and-test (Clang debug, nokvm, --config=clang --compilation_mode=dbg, bazel_buildables_clang...	8m 12s
build-and-test (GCC opt, nokvm, --config=gcc --compilation_mode=opt, bazel_buildables_gcc_opt, ba...	10m 30s
build-and-test (Clang opt + UI, nokvm, --config=clang --compilation_mode=opt, bazel_buildables_cl...	9m 52s
build-and-test (ASAN, nokvm, --config=asan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	11m 42s
build-and-test (TSAN, nokvm, --config=tsan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	8m 47s
build-and-test-status	4s
	1h 17m 16s

Provide feedback