feat: enhance partition settings to manage non-partitionable resourcetypes

[patrick-werner]

🔧 Make List of Non-Partitionable Resource Types Configurable

Fixes #6875

📜 Problem

HAPI FHIR currently hardcodes a list of resource types that cannot be partitioned (e.g., Questionnaire, StructureDefinition, CodeSystem, etc.) inside BaseRequestPartitionHelperSvc.
In multi-tenant environments, this restricts flexibility — for example, tenants might require tenant-specific Questionnaire resources.

Overriding this behavior previously required:

• Subclassing RequestPartitionHelperSvc
• Using reflection to modify internal fields
• Overriding Spring beans manually

This approach is brittle, non-obvious, and not guaranteed to be compatible across HAPI versions.

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✅ Proposed Solution

This PR introduces a configurable list of non-partitionable resource types:

• Defines a new static default list in PartitionSettings.DEFAULT_NON_PARTITIONABLE_RESOURCE_TYPES
• Adds a field nonPartitionableResourceTypes with corresponding getter/setter in PartitionSettings
• Updates BaseRequestPartitionHelperSvc to use the configured list instead of a hardcoded set

This change preserves current defaults but allows full customization via configuration.

Closes #6875

[robogary]

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[robogary]

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