Minimize GHA permissions

Set the GitHub Actions token permission to null in most workflows.

This results in:

GITHUB_TOKEN Permissions
  Metadata: read

The default permissions, used without the null override, are either

GITHUB_TOKEN Permissions
  Actions: write
  Checks: write
  Contents: write
  Deployments: write
  Discussions: write
  Issues: write
  Metadata: read
  Packages: write
  Pages: write
  PullRequests: write
  RepositoryProjects: write
  SecurityEvents: write
  Statuses: write

or

GITHUB_TOKEN Permissions
  Actions: read
  Checks: read
  Contents: read
  Deployments: read
  Discussions: read
  Issues: read
  Metadata: read
  Packages: read
  Pages: read
  PullRequests: read
  RepositoryProjects: read
  SecurityEvents: read
  Statuses: read

Jobs triggered by PRs get read permissions, other jobs get write.

One job requires non-null permissions to function.

The dependent issues GHA needs PR/issues write permissions to add/remove
`dependent` labels. It needs status write permission to block/unblock
PRs when dependencies are missing/met. Fails with HttpError otherwise.

Signed-off-by: Daniel Farrell <dfarrell@redhat.com>

.github/workflows/dependent-issues.yml

@@ -19,6 +19,11 @@ on:
   schedule:
     - cron: '0 0/6 * * *'  # every 6 hours
 
+permissions:
+  issues: write
+  pull-requests: write
+  statuses: write
+
 jobs:
   check:
     name: Check Dependencies