GH-48342: [R] Turn off gcs by default, also if it is on, bundle. (#48343)

### Rationale for this change
Building GCS is fragile in places and we're not sure how many (if
anyone) really needs GCS. So let's turn it off by default and get some
signal that folks want it back (also hopefully by that time we're on a
more modern ABSL)

### What changes are included in this PR?
Turn off GCS by default in R builds, also bundle when it is enabled.

### Are these changes tested?

### Are there any user-facing changes?
No more GCS by default
* GitHub Issue: #48342

Author: jonkeane

r/inst/build_arrow_static.sh

@@ -78,7 +78,7 @@ ${CMAKE} -DARROW_BOOST_USE_SHARED=OFF \
     -DBoost_SOURCE=${Boost_SOURCE:-} \
     -Dlz4_SOURCE=${lz4_SOURCE:-} \
     -DARROW_FILESYSTEM=ON \
-    -DARROW_GCS=${ARROW_GCS:-$ARROW_DEFAULT_PARAM} \
+    -DARROW_GCS=${ARROW_GCS:-OFF} \
     -DARROW_JEMALLOC=${ARROW_JEMALLOC:-$ARROW_DEFAULT_PARAM} \
     -DARROW_MIMALLOC=${ARROW_MIMALLOC:-ON} \
     -DARROW_JSON=${ARROW_JSON:-ON} \
@@ -102,6 +102,7 @@ ${CMAKE} -DARROW_BOOST_USE_SHARED=OFF \
     -DCMAKE_UNITY_BUILD=${CMAKE_UNITY_BUILD:-OFF} \
     -DOPENSSL_ROOT_DIR=${OPENSSL_ROOT_DIR} \
     -Dre2_SOURCE=${re2_SOURCE:-BUNDLED} \
+    -Dabsl_SOURCE=${absl_SOURCE:-BUNDLED} \
     -Dxsimd_SOURCE=${xsimd_SOURCE:-} \
     -Dzstd_SOURCE=${zstd_SOURCE:-} \
     ${EXTRA_CMAKE_FLAGS} \