feat: Make defaultVariant and value optional

[marcozabel]

This PR

Updates the test cases to use the DEFAULT reason if no defaultVariant was set or the targeting rules did not evaluate a match.

Related Issues

open-feature/flagd#1856

Notes

Follow-up Tasks

How to test

[gemini-code-assist]

Summary of Changes

Hello @marcozabel, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the flag evaluation process by ensuring that when a defaultVariant is not explicitly defined or when targeting rules fail to produce a match, the flag evaluation correctly reports a DEFAULT reason. This change improves the clarity of flag resolution outcomes, moving away from an ERROR state in such scenarios, and is reflected in updated Gherkin test cases.

Highlights

• Test Case Updates: Updated existing test cases in gherkin/evaluation.feature to align with the new behavior where a DEFAULT reason is returned when no defaultVariant is set or targeting rules do not evaluate a match.
• Reason and Error Code Changes: Modified the expected reason from ERROR to DEFAULT and removed the FLAG_NOT_FOUND error_code for scenarios where flags resolve to a default state due to missing defaultVariant or targeting rule mismatches.

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[gemini-code-assist]

Code Review

This pull request updates Gherkin test cases to reflect a change in behavior for flags without a defaultVariant. The new expectation is to return a DEFAULT reason instead of a FLAG_NOT_FOUND error. The changes in the test scenarios correctly capture this new logic. My review includes suggestions to remove a couple of redundant test cases that were introduced as a result of these changes, which will help improve the clarity and maintainability of the test suite.

[leakonvalinka]

I think we only want to change the reason column to DEFAULT here and leave the default column as it was. The way I understood the task described in the issue is that we only want to make the defaultVariant optional, but not the code-default value (= the default column here), because that's what we want to fall back to if no targeting variant matches/exists + no default variant exists either.

[leakonvalinka]

Looks good to me now