[BUG][opensearch] helm lint fails if using extraObjects

[cyanidium]

Describe the bug
When running helm lint and creating any extra objects using the extraObjects value, helm lint fails with:

[ERROR] templates/extraManifests.yaml: unable to parse YAML: invalid Yaml document separator: apiVersion: apps/v1

To Reproduce
Steps to reproduce the behavior:

1. Create a values.yaml with extraObjects defined
2. Run helm list -f values.yaml charts/opensearch from the repo top level
3. See error

Expected behavior
There should be no errors during linting.

Chart Name
opensearch

Screenshots
If applicable, add screenshots to help explain your problem.

Host/Environment (please complete the following information):

• Helm Version: v3.16.2
• Kubernetes Version: N/A

Additional context
This is a known issue with helm and only affects linting, not the applied templates:
helm/helm#10149

[prudhvigodithi]

[Triage]
Thanks @cyanidium we can get the PR's reviewed and merged for this issue.
@peterzhuamazon