Add replxx/jemalloc into fasttest build of clickhouse

Both of the are pretty small, and so should not affect build time, but
will have additional bonus, since jemalloc is the production allocator
and replxx is just useful to use binary with completion (and later some
test can be enabled for fasttest with completion)

docker/test/fasttest/run.sh

@@ -173,6 +173,8 @@ function clone_submodules
             contrib/dragonbox
             contrib/fast_float
             contrib/NuRaft
+            contrib/jemalloc
+            contrib/replxx
         )
 
         git submodule sync
@@ -193,6 +195,8 @@ function run_cmake
         "-DENABLE_THINLTO=0"
         "-DUSE_UNWIND=1"
         "-DENABLE_NURAFT=1"
+        "-DENABLE_JEMALLOC=1"
+        "-DENABLE_REPLXX=1"
     )
 
     # TODO remove this? we don't use ccache anyway. An option would be to download it