Shorten metadata_expire on internal RPM repos (#526)

A package pinned in hieradata right after its RPM lands in artifactapi is invisible to dnf until the host's 1h cached metadata expires, so the first Puppet run after a release cannot find the version.

- Set `metadata_expire` 60s on `rpm-internal`/`rpm-vendor` and their per-release variants for AlmaLinux and Fedora
- Leave upstream mirrors on the 1h default
- Drop the stale expiry note in `profiles::dns::updater`

Reviewed-on: #526
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>

hieradata/os/AlmaLinux/all_releases.yaml

@@ -77,6 +77,7 @@ profiles::yum::global::repos:
     baseurl: https://artifactapi.k8s.syd1.au.unkin.net/api/v1/local/rpm-internal/
     gpgcheck: false
     mirrorlist: absent
+    metadata_expire: '60'
   rpm-vendor:
     name: rpm-vendor
     descr: rpm-vendor repository
@@ -84,6 +85,7 @@ profiles::yum::global::repos:
     baseurl: https://artifactapi.k8s.syd1.au.unkin.net/api/v1/local/rpm-vendor/
     gpgcheck: false
     mirrorlist: absent
+    metadata_expire: '60'
   # Per-release variants, resolved from the host's EL major version so el8
   # hosts pull rpm-internal-el8/rpm-vendor-el8, el9 hosts el9, etc.
   rpm-internal-release:
@@ -93,6 +95,7 @@ profiles::yum::global::repos:
     baseurl: https://artifactapi.k8s.syd1.au.unkin.net/api/v1/local/rpm-internal-el%{facts.os.release.major}/
     gpgcheck: false
     mirrorlist: absent
+    metadata_expire: '60'
   rpm-vendor-release:
     name: rpm-vendor-el%{facts.os.release.major}
     descr: rpm-vendor-el%{facts.os.release.major} repository
@@ -100,6 +103,7 @@ profiles::yum::global::repos:
     baseurl: https://artifactapi.k8s.syd1.au.unkin.net/api/v1/local/rpm-vendor-el%{facts.os.release.major}/
     gpgcheck: false
     mirrorlist: absent
+    metadata_expire: '60'
 
   # Additional repositories - default to absent, roles can override with ensure: present
   # FRRouting repositories