CI config for Bazel: Remove existing directory before creating one

CI was broken at https://buildkite.com/bazel/bazel-at-head-plus-downstream/builds/1434
But Bazel Auto Sheriff failed to detect the true culprit (https://buildkite.com/bazel/culprit-finder/builds/282), because our setup stage will fail in a consecutive second run. This change will fix the issue.

RELNOTES: None
PiperOrigin-RevId: 302857381
diff --git a/.bazelci/postsubmit.yml b/.bazelci/postsubmit.yml
index 364d69b..5e3796d 100644
--- a/.bazelci/postsubmit.yml
+++ b/.bazelci/postsubmit.yml
@@ -5,6 +5,7 @@
       - sed -i.bak -e 's/^# android_sdk_repository/android_sdk_repository/' -e 's/^#
         android_ndk_repository/android_ndk_repository/' WORKSPACE
       - rm -f WORKSPACE.bak
+      - rm -rf $HOME/bazeltest
       - mkdir $HOME/bazeltest
     build_flags:
       - "--test_env=TEST_INSTALL_BASE=$HOME/bazeltest/install_base"
@@ -44,6 +45,7 @@
       - sed -i.bak -e 's/^# android_sdk_repository/android_sdk_repository/' -e 's/^#
         android_ndk_repository/android_ndk_repository/' WORKSPACE
       - rm -f WORKSPACE.bak
+      - rm -rf $HOME/bazeltest
       - mkdir $HOME/bazeltest
     build_flags:
       - "--test_env=TEST_INSTALL_BASE=$HOME/bazeltest/install_base"
@@ -79,6 +81,7 @@
       - sed -i.bak -e 's/^# android_sdk_repository/android_sdk_repository/' -e 's/^#
         android_ndk_repository/android_ndk_repository/' WORKSPACE
       - rm -f WORKSPACE.bak
+      - rm -rf $HOME/bazeltest
       - mkdir $HOME/bazeltest
     build_flags:
       - "--test_env=TEST_INSTALL_BASE=$HOME/bazeltest/install_base"
@@ -121,6 +124,7 @@
       - sed -i.bak -e 's/^# android_sdk_repository/android_sdk_repository/' -e 's/^#
         android_ndk_repository/android_ndk_repository/' WORKSPACE
       - rm -f WORKSPACE.bak
+      - rm -rf $HOME/bazeltest
       - mkdir $HOME/bazeltest
     build_flags:
       - "--test_env=TEST_INSTALL_BASE=$HOME/bazeltest/install_base"
@@ -144,6 +148,7 @@
       - sed -i.bak -e 's/^# android_sdk_repository/android_sdk_repository/' -e 's/^#
         android_ndk_repository/android_ndk_repository/' WORKSPACE
       - rm -f WORKSPACE.bak
+      - rm -rf $HOME/bazeltest
       - mkdir $HOME/bazeltest
     build_flags:
       - "--test_env=TEST_INSTALL_BASE=$HOME/bazeltest/install_base"
diff --git a/.bazelci/presubmit.yml b/.bazelci/presubmit.yml
index 8cd8c48..367b9c3 100644
--- a/.bazelci/presubmit.yml
+++ b/.bazelci/presubmit.yml
@@ -6,6 +6,7 @@
       - sed -i.bak -e 's/^# android_sdk_repository/android_sdk_repository/' -e 's/^#
         android_ndk_repository/android_ndk_repository/' WORKSPACE
       - rm -f WORKSPACE.bak
+      - rm -rf $HOME/bazeltest
       - mkdir $HOME/bazeltest
     build_flags:
       - "--test_env=TEST_INSTALL_BASE=$HOME/bazeltest/install_base"
@@ -43,6 +44,7 @@
       - sed -i.bak -e 's/^# android_sdk_repository/android_sdk_repository/' -e 's/^#
         android_ndk_repository/android_ndk_repository/' WORKSPACE
       - rm -f WORKSPACE.bak
+      - rm -rf $HOME/bazeltest
       - mkdir $HOME/bazeltest
     build_flags:
       - "--test_env=TEST_INSTALL_BASE=$HOME/bazeltest/install_base"
@@ -76,6 +78,7 @@
       - sed -i.bak -e 's/^# android_sdk_repository/android_sdk_repository/' -e 's/^#
         android_ndk_repository/android_ndk_repository/' WORKSPACE
       - rm -f WORKSPACE.bak
+      - rm -rf $HOME/bazeltest
       - mkdir $HOME/bazeltest
     build_flags:
       - "--test_env=TEST_INSTALL_BASE=$HOME/bazeltest/install_base"
@@ -115,6 +118,7 @@
       - sed -i.bak -e 's/^# android_sdk_repository/android_sdk_repository/' -e 's/^#
         android_ndk_repository/android_ndk_repository/' WORKSPACE
       - rm -f WORKSPACE.bak
+      - rm -rf $HOME/bazeltest
       - mkdir $HOME/bazeltest
     build_flags:
       - "--test_env=TEST_INSTALL_BASE=$HOME/bazeltest/install_base"
@@ -136,6 +140,7 @@
       - sed -i.bak -e 's/^# android_sdk_repository/android_sdk_repository/' -e 's/^#
         android_ndk_repository/android_ndk_repository/' WORKSPACE
       - rm -f WORKSPACE.bak
+      - rm -rf $HOME/bazeltest
       - mkdir $HOME/bazeltest
     build_flags:
       - "--test_env=TEST_INSTALL_BASE=$HOME/bazeltest/install_base"