pw_env_setup: Add helper to install CIPD hook
pw_env_setup: Add helper to install CIPD hook

Add a helper in util.sh to install the CIPD post-checkout hook. It's not
used anywhere, but downstream projects can add it to their local copy of
bootstrap.sh.

Change-Id: Iaaaeffe1d9fe163ff6b1552618b35dc5808d7c9b
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/105165
Commit-Queue: Rob Mohr <d07614a8a0b466db08f68224f87d738b0f9615cf@google.com>
Reviewed-by: Anthony DiGirolamo <4cc40125edc24ec5bc72df7917ea0b403ee8cebe@google.com>

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed