Export of internal Abseil changes

--
d3a10a071226497cd34be0f41cb55449193b7172 by Andy Soffer <asoffer@google.com>:

Removing formatting traits that were only used internally. ON_CALL/EXPECT_CALL do a sufficient job here.

PiperOrigin-RevId: 288342973

--
df8180038ea36a0876a84fdc163d1319a611f9db by Greg Falcon <gfalcon@google.com>:

Add CI testing for alternate options.h settings.

PiperOrigin-RevId: 288323951
GitOrigin-RevId: d3a10a071226497cd34be0f41cb55449193b7172
Change-Id: I26c75a1ededd52dd2c5a4c50e220d0b8a52d5c7c

absl/strings/BUILD.bazel

@@ -412,6 +412,7 @@ cc_test(
     copts = ABSL_TEST_COPTS,
     visibility = ["//visibility:private"],
     deps = [
+        ":internal",
         ":pow10_helper",
         ":strings",
         "//absl/base:config",

absl/strings/CMakeLists.txt

@@ -275,6 +275,7 @@ absl_cc_test(
     ${ABSL_TEST_COPTS}
   DEPS
     absl::strings
+    absl::strings_internal
     absl::core_headers
     absl::pow10_helper
     absl::config

absl/strings/numbers_test.cc

@@ -40,6 +40,7 @@
 #include "absl/random/distributions.h"
 #include "absl/random/random.h"
 #include "absl/strings/internal/numbers_test_common.h"
+#include "absl/strings/internal/ostringstream.h"
 #include "absl/strings/internal/pow10_helper.h"
 #include "absl/strings/str_cat.h"