[REL-10407] [Flag status tools] Updating OAS to consider FlagStatuses.LastRequested as nullable.

[nieblara]

Upon using the get_flag_statuses_across_environments tool was failing on Zod validation when calling the flag status API.

The issue: when requesting flag statuses across environments, the API returns null for lastRequested when a flag has never been evaluated, but our OpenAPI spec didn't mark this field as nullable.

We plan on fixing the OAS at the source, this change enables that tool to be used while we work that out.

FILES CHANGED schemas/openapi.json

Describe the solution you've provided
Feature flag status:

• Updated the FeatureFlagStatus type and related schemas to allow lastRequested to be null, improving flexibility when this timestamp is absent. [1] [2] [3]
• Marked lastRequested as nullable in the API schemas (schemas/openapi.json and schemas/output.json), ensuring the OpenAPI documentation accurately reflects possible values. [1] [2] [3] [4]

Describe alternatives you've considered

Ideally, we make it so that the OAS at the source is accurate so that clients generating types from the schema dont encounter these issues, but that requires some more work in Gonfalon that will take a bit.
See https://github.com/launchdarkly/gonfalon/pull/54762 for details

before:

after:

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Related Jira issue: REL-10407: Fix API drift when fetching flag status across environments

[bwoskow-ld]

Looks good to me.

We plan on fixing the OAS at the source

Thank you for making the change upstream!