ci: enable HTTP caching for Bazel on Windows

This commit enables Bazel HTTP caching for Windows runs.

Before:
```
bazel-e2e-cli-win: 22m 39s
```

After:
```
bazel-e2e-cli-win: 8m 32s
```

.circleci/bazel.linux.rc

@@ -0,0 +1,5 @@
+# Import config items common to both Linux and Windows setups.
+# https://docs.bazel.build/versions/master/guide.html#bazelrc-syntax-and-semantics
+import %workspace%/.circleci/bazel.common.rc
+
+build --config=remote

.circleci/bazel.windows.rc

@@ -0,0 +1,8 @@
+# Import config items common to both Linux and Windows setups.
+# https://docs.bazel.build/versions/master/guide.html#bazelrc-syntax-and-semantics
+import %workspace%/.circleci/bazel.common.rc
+
+build --remote_cache=https://storage.googleapis.com/angular-cli-windows-bazel-cache
+build --remote_accept_cached=true
+build --remote_upload_local_results=true
+build --google_default_credentials

.circleci/dynamic_config.yml

@@ -144,9 +144,19 @@ commands:
         type: env_var_name
         default: CIRCLE_PROJECT_REPONAME
     steps:
-      - run: sudo cp .circleci/bazel.rc /etc/bazel.bazelrc
+      - run:
+          name: 'Copy Bazel RC'
+          shell: bash
+          command: |
+            # Conditionally, copy bazel configuration based on the current VM
+            # operating system running. We detect Windows by checking for `%AppData%`.
+            if [[ -n "${APPDATA}" ]]; then
+              cp "./.circleci/bazel.windows.rc" ".bazelrc.user";
+            else
+              cp "./.circleci/bazel.linux.rc" ".bazelrc.user";
+            fi
       - devinfra/setup-bazel-remote-exec:
-          bazelrc: ./.bazelrc.user
+          shell: bash
 
   install_python:
     steps:
@@ -307,7 +317,6 @@ jobs:
     steps:
       - custom_attach_workspace
       - setup_bazel_rbe
-      - run: sudo cp .circleci/bazel.rc /etc/bazel.bazelrc
       - when:
           # The default nodeversion runs all *excluding* other versions
           condition:
@@ -454,6 +463,7 @@ jobs:
       - checkout
       - rebase_pr_win
       - setup_windows
+      - setup_bazel_rbe
       - restore_cache:
           keys:
             - *cache_key_win