[Copilot] Implement spector tests for 42 scenario groups

[JialinHuang803]

Task: Implement Spector Integration Tests

Use the spector-test-implementer skill to implement test files for the following not-implemented scenario groups.
Not-implemented scenario groups:

• Azure_ClientGenerator_Core_ClientDefaultValue (4 scenarios: getHeaderParameter, getOperationParameter, getPathParameter, putModelProperty)
• Azure_ClientGenerator_Core_Override_GroupParameters (1 scenarios: group)
• Azure_Core_Page (2 scenarios: withParameterizedNextLink, withRelativeNextLink)
• Azure_ResourceManager_CommonProperties_Error (1 scenarios: createForUserDefinedError)
• Azure_ResourceManager_MultiServiceOlderVersions_ComputeDisk_Disks (2 scenarios: createOrUpdate, get)
• Azure_ResourceManager_MultiServiceOlderVersions_Compute_VirtualMachines (2 scenarios: createOrUpdate, get)
• Azure_ResourceManager_MultiServiceSharedModels_Compute_VirtualMachines (2 scenarios: createOrUpdate, get)
• Azure_ResourceManager_MultiServiceSharedModels_Storage_StorageAccounts (2 scenarios: createOrUpdate, get)
• Azure_ResourceManager_MultiService_ComputeDisk_Disks (2 scenarios: createOrUpdate, get)
• Azure_ResourceManager_MultiService_Compute_VirtualMachines (2 scenarios: createOrUpdate, get)
• Azure_ResourceManager_OperationTemplates_Lro (1 scenarios: exportArray)
• Azure_ResourceManager_Resources_TopLevel (1 scenarios: update)
• Resiliency_ServiceDriven (1 scenarios: breakTheGlass)
• Service_MultiService_ServiceA_Foo (1 scenarios: test)
• Service_MultiService_ServiceB_Bar (1 scenarios: test)
• Authentication_Noauth_Union (2 scenarios: validNoAuth, validToken)
• Documentation_Lists (3 scenarios: bulletPointsModel, bulletPointsOp, numbered)
• Documentation_TextFormatting (3 scenarios: boldText, combinedFormatting, italicText)
• Encode_Duration_Header (2 scenarios: floatMillisecondsLargerUnit, floatSecondsLargerUnit)
• Encode_Duration_Query (2 scenarios: floatMillisecondsLargerUnit, floatSecondsLargerUnit)
• Parameters_Query_Constant (1 scenarios: post)
• Payload_JsonMergePatch (3 scenarios: createResource, updateOptionalResource, updateResource)
• Payload_MultiPart_FormData (9 scenarios: anonymousModel, basic, binaryArrayParts, checkFileNameAndContentType, fileArrayAndBasic, jsonPart, multiBinaryParts, optionalParts, withWireName)
• Payload_MultiPart_FormData_File (3 scenarios: uploadFileArray, uploadFileRequiredFilename, uploadFileSpecificContentType)
• Payload_MultiPart_FormData_HttpParts (1 scenarios: jsonArrayAndFileArray)
• Payload_MultiPart_FormData_HttpParts_ContentType (3 scenarios: imageJpegContentType, optionalContentType, requiredContentType)
• Payload_MultiPart_FormData_HttpParts_NonString (1 scenarios: float)
• Payload_Pageable_PageSize (2 scenarios: listWithPageSize, listWithoutContinuation)
• Payload_Pageable_ServerDrivenPagination (2 scenarios: linkString, nestedLink)
• Payload_Pageable_ServerDrivenPagination_ContinuationToken (6 scenarios: requestHeaderNestedResponseBody, requestHeaderResponseBody, requestHeaderResponseHeader, requestQueryNestedResponseBody, requestQueryResponseBody, requestQueryResponseHeader)
• Payload_Pageable_XmlPagination (2 scenarios: listWithContinuation, listWithNextLink)
• Payload_Xml_ModelWithDatetimeValue (2 scenarios: get, put)
• Payload_Xml_ModelWithEnumValue (2 scenarios: get, put)
• Payload_Xml_XmlErrorValue (1 scenarios: get)
• Response_StatusCodeRange (2 scenarios: errorResponseStatusCode404, errorResponseStatusCodeInRange)
• Streaming_Jsonl_Basic (2 scenarios: receive, send)
• Type_File_Body (8 scenarios: downloadFileDefaultContentType, downloadFileJsonContentType, downloadFileMultipleContentTypes, downloadFileSpecificContentType, uploadFileDefaultContentType, uploadFileJsonContentType, uploadFileMultipleContentTypes, uploadFileSpecificContentType)
• Type_Model_Visibility (7 scenarios: deleteModel, getModel, headModel, patchModel, postModel, putModel, putReadOnlyModel)
• Type_Union_Discriminated_Envelope_Object_CustomProperties (2 scenarios: get, put)
• Type_Union_Discriminated_Envelope_Object_Default (2 scenarios: get, put)
• Type_Union_Discriminated_NoEnvelope_CustomDiscriminator (2 scenarios: get, put)
• Type_Union_Discriminated_NoEnvelope_Default (2 scenarios: get, put)
  Instructions:

1. For each scenario group above, check if a .spec.ts file already exists in packages/typespec-ts/test/azureModularIntegration/ — skip if it does
2. For remaining groups, follow the spector-test-implementer workflow to implement the tests
3. Report which tests passed and which failed
   PR description format:
   The PR description must use this format for each section:

New spec files

For each newly created .spec.ts file, use this structure:

• Scenario_Group_Name — scenarioGroupName.spec.ts
  • ✅ scenarioName1
  • ✅ scenarioName2
  • ❌ scenarioName3 (reason for failure)

Updated existing spec files

Same structure as above, but for spec files that already existed and were updated with new scenarios.

Known skips / emitter limitations

List any scenarios that were skipped due to emitter bugs or limitations, with the reason.

Results should be commented on issue #3883.