Pin logarchiver S3 endpoint; drop archiver from vector-test

- Pin the RGW endpoint/bucket in the logarchiver config to the proven
  s3.ceph.unkin.net (ignore the secret's S3_ENDPOINT/BUCKET_NAME; AWS creds still
  come from the secret) to match the Vector archiver exactly.
- Remove the deleted vector/archiver.yaml from the vector-test validate step.

Claude-Session: https://claude.ai/code/session_015ur3i7D2azsMAWTSVABApv

apps/base/logging/configmap_logarchiver.yaml

@@ -17,6 +17,16 @@ data:
       max_bytes: 67108864
       max_events: 200000
       max_age: 2m
+    # Pin the proven RGW endpoint/bucket; ignore the secret's S3_ENDPOINT/BUCKET_NAME
+    # (AWS creds still come from the secret env). endpoint_env/bucket_env off.
+    s3:
+      endpoint: "https://s3.ceph.unkin.net"
+      bucket: "logs-archive"
+      region: "us-east-1"
+      path_style: true
+      ca_file: /etc/vault-ca/ca.crt
+      endpoint_env: ""
+      bucket_env: ""
     crypto:
       key_name: logarchive
       pubkey_source: vault