Compute memory/ephemeral-storage limits from requests, drop default CPU limits

Every chart now renders its container resources through a duplicated
_helpers.tpl helper (reference implementation in template-chart): requests
ship as chart defaults, missing memory and ephemeral-storage limits are
computed as resources.limitFactor x the request (default 3, satisfactory
keeps 2 to preserve its previously published 8Gi limit), an explicitly set
limit always wins, and a CPU limit is only rendered when set explicitly.
Fixed limit defaults are removed from all values.yaml files; teamspeak-server
gains a values-driven resources block instead of hardcoded template values.
Major version bump for all published charts.

matrix-synapse/values.yaml

@@ -21,23 +21,23 @@ matrix:
           drop:
             - ALL
     resources:
-      limits:
-        memory: "128Mi"
-        cpu: "250m"
-        ephemeralStorage: "100Mi"
+      # Limits are optional: memory and ephemeral-storage limits default to
+      # limitFactor x the request, an explicitly set limit always wins, and a
+      # CPU limit is only set when configured explicitly under "limits".
+      limitFactor: 3
       requests:
         memory: "64Mi"
         cpu: "125m"
         ephemeralStorage: "50Mi"
   resources:
+    # Limits are optional: memory and ephemeral-storage limits default to
+    # limitFactor x the request, an explicitly set limit always wins, and a
+    # CPU limit is only set when configured explicitly under "limits".
+    limitFactor: 3
     requests:
       memory: "1Gi"
       cpu: "1"
       ephemeralStorage: "1Gi"
-    limits:
-      memory: "2Gi"
-      cpu: "2"
-      ephemeralStorage: "2Gi"
 
 storage:
   amount: 10Gi