Remove all autotools usage (#10132)

* Bazelfying conformance tests

Adding infrastructure to "Bazelify" languages other than Java and C++

* Delete benchmarks for languages supported by other repositories

* Bazelfying benchmark tests

* Bazelfying python

Use upb's system python rule instead of branching tensorflow

* Bazelfying Ruby

* Bazelfying C#

* Bazelfying Objective-c

* Bazelfying Kokoro mac builds

* Bazelfying Kokoro linux builds

* Deleting all deprecated files from autotools cleanup

This boils down to Makefile.am and tests.sh and all of their remaining references

* Cleanup after PR reorganizing

- Enable 32 bit tests
- Move conformance tests back
- Use select statements to select alternate runtimes
- Add internal prefixes to proto library macros

* Updating READMEs to use bazel instead of autotools.

* Bazelfying Kokoro release builds

* First round of review fixes

* Second round of review fixes

* Third round of review fixes

* Filtering out conformance tests from Bazel on Windows (b/241484899)

* Add version metadata that was previously scraped from configure.ac

* fixing typo from previous fix

* Adding ruby version tests

* Bumping pinned upb version, and adding tests to python CI
diff --git a/objectivec/BUILD.bazel b/objectivec/BUILD.bazel
index c18788f..153894f 100644
--- a/objectivec/BUILD.bazel
+++ b/objectivec/BUILD.bazel
@@ -1,5 +1,6 @@
 load("@rules_cc//cc:defs.bzl", "objc_library")
 load("@rules_pkg//:mappings.bzl", "pkg_files", "strip_prefix")
+load("//conformance:defs.bzl", "conformance_test")
 
 objc_library(
     name = "objectivec",
@@ -90,6 +91,20 @@
     visibility = ["//visibility:public"],
 )
 
+################################################################################
+# Tests
+################################################################################
+
+conformance_test(
+    name = "conformance_test",
+    failure_list = "//conformance:failure_list_objc.txt",
+    testee = "//conformance:conformance_objc",
+)
+
+################################################################################
+# Distribution files
+################################################################################
+
 pkg_files(
     name = "dist_files",
     srcs = glob([