Update workflows for security hardening. (#4192)

Also a small pass on workflow names.

Note, I'm a little concerned that the test/nightly release/pre-commit
endpoints may be fragile. At the same time, it's also where it may be
most useful, to prevent network access by arbitrary test code. I think
this is imperfect, but maybe we can try it out and see if it's much of
an issue.

Note, the discord wiki action is currently broken, this should fix it.

.github/workflows/pre_commit_suggestions.yaml

@@ -33,9 +33,16 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@63c24ba6bd7ba022e95695ff85de572c04a18142 # v2.7.0
+        uses: step-security/harden-runner@17d0e2bd7d51742c71671bd19fa12bdc9d40a3d6 # v2.8.1
         with:
-          egress-policy: audit
+          disable-sudo: true
+          egress-policy: block
+          # prettier-ignore
+          allowed-endpoints: >
+            api.github.com:443
+            github.com:443
+            objects.githubusercontent.com:443
+            raw.githubusercontent.com:443
 
       - uses: reviewdog/action-setup@3f401fe1d58fe77e10d665ab713057375e39b887 # v1.3.0
         with: