Enable pushrebase for large repo in all integration tests

Summary: pushrebase is not enabled for the large repo, so tests where we call `commit_to_large_repo` two consecutive times are very flaky.

Reviewed By: andreacampi

Differential Revision: D64398797

fbshipit-source-id: e7906088e97c871092254698027d4137890a2c92

eden/mononoke/tests/integration/cross_repo/test-cross-repo-initial-import-catching-up.t

@@ -148,7 +148,6 @@ Add more commits to small repo
   X Repo Sync execution finished from small repo small_repo to large repo large_repo
 
   $ clone_and_log_large_repo "ccfdf094e4710a77de7b36c4324fa7ee64dafba4067726e383db62273553466b"
-  abort: destination 'large_repo' is not empty
   o  71fdac6141e7 D
   │   smallrepofolder1/bar/c.txt |  2 +-
   │   1 files changed, 1 insertions(+), 1 deletions(-)

eden/mononoke/tests/integration/library-xrepo-sync-with-git-submodules.sh

@@ -162,9 +162,9 @@ function sl_log() {
 function clone_and_log_large_repo {
   LARGE_BCS_IDS=( "$@" )
   cd "$TESTTMP" || exit
-  hg clone -q mono:$LARGE_REPO_NAME "$LARGE_REPO_NAME"
-  cd "$LARGE_REPO_NAME" || exit
+  clone_large_repo
 
+  cd "$LARGE_REPO_NAME" || exit
 
   for LARGE_BCS_ID in "${LARGE_BCS_IDS[@]}"; do
     LARGE_CS_ID=$(mononoke_newadmin convert --from bonsai --to hg -R "$LARGE_REPO_NAME" "$LARGE_BCS_ID" --derive)
@@ -186,3 +186,14 @@ function clone_and_log_large_repo {
       -i "$LARGE_BCS_ID" 2>&1| rg "Error" || true # filter to keep only Error line if there is an error
   done
 }
+
+# Clone the large repo if it hasn't been cloned yet
+function clone_large_repo {
+  orig_pwd=$(pwd)
+  cd "$TESTTMP" || exit
+  if [ ! -d "$LARGE_REPO_NAME" ]; then
+    hg clone -q "mono:$LARGE_REPO_NAME" "$LARGE_REPO_NAME"
+  fi
+
+  cd "$orig_pwd" || exit
+}