ci: Automatically cancel bootstrap step after 1 hour in wpt linux/mach (#38358)

Introduces a timeout for each WPT run chunk job, set to 1 hour, after
which it will be automatically canceled.

Testing: 
Fixes: #38348

---------

Signed-off-by: Jerens Lensun <jerensslensun@gmail.com>

.github/workflows/linux-wpt.yml

@@ -65,6 +65,7 @@ jobs:
       - name: Setup Python
         uses: ./.github/actions/setup-python
       - name: Bootstrap dependencies
+        timeout-minutes: 60
         run: |
           sudo apt update
           sudo apt install -qy --no-install-recommends mesa-vulkan-drivers fonts-noto-cjk

.github/workflows/mac-wpt.yml

@@ -40,6 +40,7 @@ jobs:
       - name: Setup Python
         uses: ./.github/actions/setup-python
       - name: Prep test environment
+        timeout-minutes: 60
         run: |
           gtar -xzf target.tar.gz
           ./mach bootstrap --skip-lints