fix(sdk): leave deepCopy, isOwnAnchor, startsWith and ignoreCase to Egeria's defaults

[dwolfson]

Summary

Four pyegeria request-model defaults differed from the Egeria beans they mirror. Request bodies are serialised with exclude_none=True, so a non-None default is always sent and overrides Egeria's own default, even when the caller never mentioned the field. All four now default to None: an unset value is left out and Egeria's default applies.

Model / field	pyegeria default was	Egeria default
TemplateRequestBody.deep_copy	False	TemplateOptions.deepCopy = true
NewOpenMetadataElementRequestBody.is_own_anchor	False	AnchorOptions.isOwnAnchor = true
SearchStringRequestBody.starts_with	True	SearchOptions.startsWith = false
SearchStringRequestBody.ignore_case	False	SearchOptions.ignoreCase = true

The user-visible bug: deepCopy

With deepCopy: false, Egeria creates only the top-level element from a template and none of its anchored attachments. A data set created from the PostgreSQL Tabular Data Set Collection template got no connection, so it couldn't be read, provisioned or surveyed, and nothing reported an error.

• Affected: create_elem_from_template, every typed *_element_from_template creator in AutomatedCuration, and Dr.Egeria's Create Element / Create <Type> Element.
• Reported impact: 81 Coco TabularDataSetCollection assets had to be recreated.
• Dr.Egeria: Create Element gains an optional Deep Copy attribute (Bool, default true) for when a shallow copy is actually wanted.

The other three

Found by comparing every request model's bool defaults against its Java bean, including inherited fields. That comparison now reports no mismatches.

The find_* method signatures still pass starts_with explicitly (pyegeria's prefix-match convention), so searches through those methods behave the same as before. Only callers passing raw dict bodies without these keys see a change.

Test plan

• New tests/micro-tests/test_template_deep_copy_default.py:
  • unset flags are omitted and explicit values are still sent
  • Dr.Egeria Deep Copy maps to deepCopy
  • the key test fails without the fix
• 724 micro-tests pass
• All 21 Dr.Egeria test documents give identical validate results with and without the change
• Live, against a local Egeria server: the reporter's exact call (PostgreSQL template, no deepCopy)
  • the request body contained no deepCopy
  • the new asset got its own copied VirtualConnection → embedded VirtualConnection → Endpoint, with placeholders substituted (jdbc:postgresql://host.docker.internal:5442/coco_data_hub?currentSchema=dd0580_deepcopy_test)
  • deleted with cascadeDelete; all four GUIDs now return 404

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