feat: add resources for migration containers

[marlenekoh]

Allow resources limits and requests to be configured for the migration job.

Description

Added the following to values.yaml

datastore:
   engine: memory
   uri:
   uriSecret:
   maxCacheSize:
   maxOpenConns:
   maxIdleConns:
   connMaxIdleTime:
   connMaxLifetime:
   applyMigrations: true
+  migrations:
+    resources: {}

References

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected