[BUG] Advanced Parsing: default parsing models are end-of-life, ingestion fails with 404 and syncs silently succeed

[NitroBoss]

Describe the bug

Enabling Advanced Parsing on a bot knowledge base breaks document ingestion for the default model choices, and the failure is silent: the sync can end up looking completed while zero documents were indexed, so the bot answers nothing from its knowledge.

Error from the EmbeddingSynchronizeDataSourceHandler logs:

[ERROR] ValidationException: An error occurred (ValidationException) when calling the
IngestKnowledgeBaseDocuments operation: Knowledge base role
arn:aws:iam::<account-id>:role/AmazonBedrockExecutionRoleForKnowledgeBase... is not able
to call the specified model
arn:aws:bedrock:eu-central-2::foundation-model/anthropic.claude-3-5-sonnet-20240620-v1:0:
This model version has reached the end of its life. (Status Code: 404)

Root cause

The parsing model allowlist (backend/app/routes/schemas/bot_kb.py):

type_kb_parsing_model = Literal[
    "anthropic.claude-3-5-sonnet-v1",
    "anthropic.claude-3-haiku-v1",
    "anthropic.claude-3-sonnet-v1",
    "disabled",
]

• anthropic.claude-3-5-sonnet-v1 and anthropic.claude-3-sonnet-v1 have reached end of life on Bedrock: every ingestion using them fails with the 404 above.
• anthropic.claude-3-haiku-v1 is the only option still invocable (verified via list-foundation-models: it is the last Claude model with ON_DEMAND inference), but it is a legacy early-2024 model.
• Simply bumping the list to newer models is not enough: every current Claude model on Bedrock is INFERENCE_PROFILE-only, so the parsing configuration would need inference-profile ARN support (and matching KB role permissions across the profile regions). Today getParsingModel in cdk/lib/utils/bedrock-knowledge-base-args.ts only builds base foundation-model references.

The frontend picker (frontend/src/features/knowledgeBase/pages/BotKbEditPage.tsx) exposes the same options. Verified at v3.17.0 and on current v3 HEAD.

Steps to reproduce

1. Create or edit a bot with a knowledge base.
2. Set Advanced Parsing Model to Claude 3.5 Sonnet v1 (the first non-disabled option).
3. Add a document and sync: ingestion fails ("This model version has reached the end of its life").
4. Workaround: set Advanced Parsing back to Disabled and the same documents ingest fine.

Expected behavior

Advanced Parsing works with the offered models, and per-document ingestion failures surface in the bot sync status instead of failing silently.

Suggested fix

1. Short term: stop offering the end-of-life models and keep stored bots deserializable → PR fix: stop offering end-of-life models for Advanced Parsing #1127.
2. Follow-up: support inference profiles for parsing (per the AWS docs on parsing options and supported models for parsing, current Claude / Nova vision families are supported parsers) so a current-generation model can be offered again.
3. Surface per-document IngestKnowledgeBaseDocuments failures in the sync status, and validate region availability of the configured parsing model.