fix(signals): Double-check directly provided session ids to ensure they exsist.

[sortafreel]

Problem

• If the user provides incorrect session ids (manually, or sessions without replay recordings) - we still start workflows and fail

Changes

• Confirm that the session has Replay data

How did you test this code?

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Changelog: (features only) Is this feature complete?

[greptile-apps]

Additional Comments (1)

1. ee/hogai/chat_agent/session_summaries/test/test_nodes.py, line 654-697 (link)

   logic: This test may fail after this PR. The test provides specific_session_ids_to_summarize with a fake session ID that doesn't exist in ClickHouse, but the new validation code will now verify the session exists before proceeding. Since TestSessionSummarizationNode doesn't extend ClickhouseTestMixin, the validation query will return no results, causing the test to receive "No sessions were found" instead of proceeding to summarization.

   The test needs to either:

   1. Mock _validate_specific_session_ids to return the session IDs
   2. Mock database_sync_to_async like other tests in this class do

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