test: add connector test suite (Block D) — 5 files, 58 tests
Tests cover Keboola extractor (extension + legacy fallback, _remote_attach),
BigQuery extractor (remote views, contract validation), Jira service
(webhook processing, HMAC verification, HTTP mocking), Jira incremental
transform (upsert/delete, monthly parquet partitioning), and LLM providers
(factory, AnthropicExtractor retry/auth, OpenAICompatExtractor strategy
cascade, JSON extraction helpers). Also adds tests/helpers/factories.py
with WebhookEventFactory.
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