feat: Add filterType property to work item and work item template APIs models

[gokulprasanth-ni]

• This contribution adheres to CONTRIBUTING.md.

What does this Pull Request accomplish?

Add filterType property to resource models in work item and template APIs

Why should this Pull Request be merged?

This support makes it easier for the users to create work items with either Linq or Lucene resource filters

What testing has been done?

Automated integration tests are included.

[Copilot]

🟢 Approval recommended

The change is additive, follows existing JsonModel camelCase serialization conventions, and includes integration test coverage plus updated examples for the new field.

Pull request overview

Adds a filterType/filter_type field to Work Item and Work Item Template resource models so callers can explicitly indicate whether resource filters are interpreted as LINQ or LUCENE, and updates integration tests/examples to exercise and document the new behavior.

Changes:

• Introduces FilterType enum and adds filter_type to ResourcesDefinition and TemplateResourcesDefinition (serialized as filterType).
• Extends query projection enums with RESOURCES_FILTER_TYPE for both work items and templates.
• Updates integration tests and examples to set and validate filter_type (and adjusts sample filter strings accordingly).

File summaries

File	Description
tests/integration/work_item/test_work_item_client.py	Adds integration coverage for create/update/query behaviors involving resources.filter_type and updates sample filters.
nisystemlink/clients/work_item/models/_resources_definition.py	Adds FilterType enum plus filter_type fields to resource definition models.
nisystemlink/clients/work_item/models/_query_work_items_request.py	Adds WorkItemField.RESOURCES_FILTER_TYPE projection field.
nisystemlink/clients/work_item/models/_query_work_item_templates_request.py	Adds WorkItemTemplateField.RESOURCES_FILTER_TYPE projection field.
nisystemlink/clients/work_item/models/init.py	Exports FilterType from the public models package.
examples/work_item/work_items.py	Demonstrates setting filter_type for work item create/update resource filters.
examples/work_item/work_item_templates.py	Demonstrates setting filter_type for template resource filters and updates.

Review details

• Files reviewed: 7/7 changed files
• Comments generated: 0
• Review effort level: Lite

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