chore(helm): drop migrationJob values the chart never reads (#42141)

`migrationJob.retries` and `migrationJob.disableSchemaUpdate` are declared
in values.yaml but referenced by no template, no test and no README row.
Setting either changes nothing about the rendered Job.

`disableSchemaUpdate` is the misleading one: its comment promises "the job
will exit with code 0", but the Job hardcodes DISABLE_SCHEMA_UPDATE=false
and renders it after envVars/extraEnvVars precisely so nothing can turn the
migration off — that ordering is what #12809 fixed. An operator who reads
values.yaml, sets the flag and watches migrations run anyway has no way to
tell the knob is inert. `migrationJob.enabled: false` is the supported way
to skip the Job, and the componentized chart in helm/litellm already ships
a migrationJob block with neither key.

`retries` is simply dead: Jobs retry through `backoffLimit`, which the
chart does render.

Removing values keys is backward compatible — Helm ignores user values that
no template consumes, so existing releases setting either key keep working.

Adds a test pinning the override: with envVars.DISABLE_SCHEMA_UPDATE="true"
the Job's last env entry is still DISABLE_SCHEMA_UPDATE=false, so the
last-wins ordering cannot regress and the key cannot quietly come back as a
chart value. Verified by mutation: flipping the hardcoded value and moving
the entry above the envVars loop each fail the suite.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
Co-authored-by: ryan-crabbe-berri <ryan@berri.ai>

helm/litellm-helm/tests/migrations-job_tests.yaml

@@ -112,6 +112,24 @@ tests:
             name: CUSTOM_VAR
             value: "custom_value"
 
+  - it: should override a user-supplied DISABLE_SCHEMA_UPDATE so the Job always migrates
+    template: migrations-job.yaml
+    set:
+      envVars:
+        DISABLE_SCHEMA_UPDATE: "true"
+      migrationJob:
+        enabled: true
+    asserts:
+      # The Job is what owns the schema, so it renders its own
+      # DISABLE_SCHEMA_UPDATE=false after envVars and extraEnvVars. Kubernetes
+      # takes the last value for a duplicated name, so the user's "true" cannot
+      # leave the schema unmigrated. Skipping migrations is migrationJob.enabled.
+      - equal:
+          path: spec.template.spec.containers[0].env[-1]
+          value:
+            name: DISABLE_SCHEMA_UPDATE
+            value: "false"
+
   - it: should not include DATABASE_URL when deployStandalone is false
     template: migrations-job.yaml
     set:

helm/litellm-helm/values.yaml

@@ -545,7 +545,6 @@ redis:
 # Prisma migration job settings
 migrationJob:
   enabled: true # Enable or disable the schema migration Job
-  retries: 3 # Number of retries for the Job in case of failure
   backoffLimit: 4 # Backoff limit for Job restarts
   # Wall-clock budget for the whole Job, shared across every `backoffLimit`
   # retry rather than granted per attempt. Without it a migration that blocks
@@ -554,7 +553,6 @@ migrationJob:
   # stop reconciling the whole chart until someone deletes the Job by hand.
   # Set to null to opt out and restore the unbounded behaviour.
   activeDeadlineSeconds: 1800
-  disableSchemaUpdate: false # Skip schema migrations for specific environments. When True, the job will exit with code 0.
   # Optional service account for the migration job.
   # Only used when migrationJob.hooks.helm.enabled=true and serviceAccount.create=true.
   # In that case, pre-install/pre-upgrade hooks run before normal resources, so this defaults to "default".