Fix operators for state

[aangelisc]

The state operator for pull requests doesn't work as we expect so we will filter in the SQL engine instead.

[Copilot]

Pull request overview

Updates the GitHub datasource schema for the pull-requests table to avoid using the state column’s operators for pushdown filtering, since PR state filtering via the existing operator/pushdown path is not behaving as expected.

Changes:

• Removed explicit Operators: equalityOperators from pull-requests.state schema column so filtering can be handled in the SQL engine instead.

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[Copilot]

Removing Operators: equalityOperators here likely disables filter pushdown for PR state (so filtering happens in the SQL engine instead). That can significantly increase GitHub search result sizes/API usage (and rate-limit risk) for common queries; consider instead mapping the enum values to the correct GitHub search qualifiers (e.g., is:open, is:closed, is:merged) so state filtering can still be pushed down efficiently. If pushdown is intentionally disabled, add a short inline comment explaining why this column intentionally omits Operators to prevent someone from reintroducing the broken behavior later.

Suggested change

	{Name: "state", Type: schemas.ColumnTypeEnum, Values: []string{"OPEN", "CLOSED", "MERGED"}},
	{Name: "state", Type: schemas.ColumnTypeEnum, Values: []string{"OPEN", "CLOSED", "MERGED"}, Operators: equalityOperators},

[aangelisc]

I would do this but passing is:closed to GitHub also returns merged PRs 😞