Add reasonable timeouts to all workflows (#7499)

Turns out the default timeout for github actions is 6 hours (!). This PR
sets some reasonable default for all workflows, the ones invoking cargo
in some way are limited to 60 minutes and the remaining ones to
10-15mins.

.github/workflows/preview_build.yml

@@ -15,6 +15,7 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    timeout-minutes: 60
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master