Explicitly depend on //absl/strings:string_view where used.

Traditionally, `//absl/strings` provided string_view.h, but
it is its own target now and we should depend on it whenever
we include `absl/strings/string_view.h`, see comment here:

https://github.com/abseil/abseil-cpp/blob/a690167a55b9e210b7884d311759977c0f5669c9/absl/strings/BUILD.bazel#L94-L99

Apply this strict reading to absl itself.

In some cases, this also allowed to remove a dependency on the
bigger `//absl/strings` library.

PiperOrigin-RevId: 971471096
Change-Id: Id981182ae760ca11361381f7f25857ae1382b1cf

absl/synchronization/BUILD.bazel

diff --git a/absl/synchronization/BUILD.bazel b/absl/synchronization/BUILD.bazel
index 57740ef..d5438ba 100644
--- a/absl/synchronization/BUILD.bazel
+++ b/absl/synchronization/BUILD.bazel
@@ -146,6 +146,7 @@
         "//absl/debugging:stacktrace",
         "//absl/debugging:symbolize",
         "//absl/meta:type_traits",
+        "//absl/strings:string_view",
         "//absl/time",
     ] + select({
         "//conditions:default": [],
@@ -368,7 +369,6 @@
     deps = [
         ":per_thread_sem_test_common",
         ":synchronization",
-        "//absl/strings",
         "//absl/time",
         "@googletest//:gtest_main",
     ],

absl/synchronization/CMakeLists.txt

diff --git a/absl/synchronization/CMakeLists.txt b/absl/synchronization/CMakeLists.txt
index 2805000..32e8c98 100644
--- a/absl/synchronization/CMakeLists.txt
+++ b/absl/synchronization/CMakeLists.txt
@@ -113,6 +113,7 @@
     absl::nullability
     absl::raw_logging_internal
     absl::stacktrace
+    absl::string_view
     absl::symbolize
     absl::time
     absl::tracing_internal
@@ -258,7 +259,6 @@
   DEPS
     absl::per_thread_sem_test_common
     absl::synchronization
-    absl::strings
     absl::time
     GTest::gmock_main
 )