[Search] Regenerate azure-search-documents from 2026-04-01 GA spec patch (SHA d62196d)

[hizixin]

Description

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• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
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Testing Guidelines

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[Copilot]

Pull request overview

Regenerates azure-search-documents from the 2026-04-01 GA Search data-plane spec (commit d62196d…), updating generated models/utilities and APIView cross-language mappings accordingly.

Changes:

• Updated tsp-location.yaml to point at the new swagger/spec commit.
• Added a new knowledge base activity record discriminator/type (modelWebSummarization) and corresponding model/export.
• Refactored XML (de)serialization helpers in model_base.py across documents/indexes/knowledgebases; removed KnowledgeSourceIngestionPermissionOption from indexes models and updated APIView mapping.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
sdk/search/azure-search-documents/tsp-location.yaml	Bumps the spec source commit used for regeneration.
sdk/search/azure-search-documents/azure/search/documents/knowledgebases/models/_models.py	Adds KnowledgeBaseModelWebSummarizationActivityRecord; removes ingestion_permission_options from KnowledgeSourceIngestionParameters; updates discriminator docs.
sdk/search/azure-search-documents/azure/search/documents/knowledgebases/models/_enums.py	Adds KnowledgeBaseActivityRecordType.MODEL_WEB_SUMMARIZATION.
sdk/search/azure-search-documents/azure/search/documents/knowledgebases/models/init.py	Exposes the new activity record model in public imports/__all__.
sdk/search/azure-search-documents/azure/search/documents/knowledgebases/_utils/model_base.py	XML namespace handling/serialization refactor (knowledgebases flavor).
sdk/search/azure-search-documents/azure/search/documents/indexes/models/_enums.py	Removes KnowledgeSourceIngestionPermissionOption.
sdk/search/azure-search-documents/azure/search/documents/indexes/models/init.py	Removes the enum from public exports.
sdk/search/azure-search-documents/azure/search/documents/indexes/_utils/model_base.py	XML namespace handling/serialization refactor (indexes flavor).
sdk/search/azure-search-documents/azure/search/documents/_utils/model_base.py	XML namespace handling/serialization refactor (main documents flavor).
sdk/search/azure-search-documents/apiview-properties.json	Updates cross-language symbol mappings (adds new model; removes deleted enum; renames customization mapping targets).