fix(workflow_engine): Normalize error.handled values to 0/1

[kcons]

This is essentially reproducing the logic at src/sentry/api/event_search.py#L1132-L1136 to coerce this type.
Ideally, we'd be able to reuse the parsing logic to handle our filters generally, but it isn't an easy match.

Query showing known cases https://redash.getsentry.net/queries/11226/source.

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[sentry]

Bug: A filter on error.handled with an IS_IN or NOT_IN match will crash if the value is a single boolean-like string like "true".
_{Severity: MEDIUM}

Suggested Fix

Before the IS_IN/NOT_IN match handling, ensure that if the rhs value was normalized from a boolean-like string to an integer, it is converted back to a string. This will satisfy the type expectation of the IS_IN handler and prevent the ValueError. Alternatively, the IS_IN handler could be updated to gracefully handle integer inputs for boolean attributes.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location:
src/sentry/workflow_engine/handlers/condition/event_frequency_query_handlers.py#L244-L250

Potential issue: When a filter condition uses `error.handled` with an `IS_IN` or
`NOT_IN` match type, and the provided value is a single boolean-like string (e.g.,
`"true"`), the system will crash. The normalization logic converts the string value to
an integer (`1` or `0`) and assigns it to the `rhs` variable. However, the subsequent
`IS_IN`/`NOT_IN` handler expects `rhs` to be a string. The type check `isinstance(rhs,
str)` fails, leading to an unhandled `ValueError`. Although using `IS_IN` for a boolean
attribute is uncommon, the UI permits this configuration, making this a reachable crash
scenario.

[ceorourke]

very nice