bazel: Add .bazelignore entries

This prevents bazel_clang_tidy from checking the out/ dir.

Change-Id: Ie03fe4e6e62f92a0f1ad8041f93fc9cbc31fe423
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/477665
GitOrigin-RevId: a60e192fdf380268bda1b2e4f01d0faf63ac2831

.bazelignore

diff --git a/.bazelignore b/.bazelignore
index af3d0a7..a9cd728 100644
--- a/.bazelignore
+++ b/.bazelignore
@@ -1,4 +1,10 @@
 # Don't attempt to build targets under or //environment or //third_party when
 # building everything. These are not part of the project's workspace.
+.vscode
+bazel-bin
+bazel-experimental
+bazel-out
+bazel-testlogs
 environment
+out
 third_party