Add tolerations for Postgres pods in backup and restore management

[victorfernpach]

SUMMARY

This pull request adds support for specifying Kubernetes tolerations for the db-management pods in both backup and restore ansible roles. This allows the pods to be scheduled on nodes with specific taints, improving deployment flexibility.

Kubernetes tolerations support:

• Added a new variable db_management_pod_tolerations to roles/backup/defaults/main.yml for configuring tolerations as a list of dictionaries.
• Added a new variable db_management_pod_tolerations to roles/restore/defaults/main.yml for configuring tolerations as a list of dictionaries.
• Updated the roles/backup/templates/management-pod.yml.j2 template to inject the tolerations field into the pod spec if db_management_pod_tolerations is set.
• Updated the roles/restore/templates/management-pod.yml.j2 template to similarly inject the tolerations field for restore management pods.

ISSUE TYPE

• New or Enhanced Feature

ADDITIONAL INFORMATION

This fixes issues like #1774 and it is similar to what was requested here #1853