[IAM Credentials Migration] [Code build & CR package] Add session token to the secrets in curated packages helm chart if the session token is peresent

[rajeshvenkata]

We need to add session token to the secrets in curated packages helm chart if the session token is peresent.ex: in

https://github.com/aws/eks-anywhere-packages/blob/main/charts/eks-anywhere-packages/templates/awssecret.yaml

add below changes
{{- if .sessionToken }}
{{- if ne .sessionToken "" }}
AWS_SESSION_TOKEN: "{{ .sessionToken }}"
{{- end }}
{{- end }}