fix(management_api): decode identity_id in CreateUserIdentity response

[dtoxvanilla1991]

Explain your changes

Supersedes #60. The Kinde API returns identity_id instead of id when creating an identity for an existing enterprise connection. The published OpenAPI spec still only documents id, so ogen never generates identity_id on its own, and decoding such a response previously dropped the identity ID entirely.

This reimplements #60's fix with a much smaller footprint:

• fix(management_api): CreateUserIdentity response decodes identity_id … #60 vendored a local copy of the full management API spec and ran ogen --clean against it, which regenerated the entire SDK and pulled in unrelated, breaking changes (e.g. a DeleteAPIAppliationScope → DeleteAPIApplicationScope rename, a new required field on CreateApiKeyReq) on top of 6 months of spec drift against current main.
• Instead, this PR adds fix_identity_id.go, a go:generate patch step following the repo's existing convention (fix_optstring.go, fix_oneof.go) that patches just the CreateIdentityResponseIdentity type to also decode identity_id, with no vendored spec and no unrelated regen.
• EffectiveIdentityID() helper and the full test suite from fix(management_api): CreateUserIdentity response decodes identity_id … #60 are carried over unchanged.

Verified against the live spec at api-spec.kinde.com that identity_id is still undocumented upstream, so the underlying bug and fix are still necessary.

Checklist

• I have read the "Pull requests" section in the contributing guidelines.
• I agree to the terms within the code of conduct.

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📥 Commits

Reviewing files that changed from the base of the PR and between e816055 and 4176782.

📒 Files selected for processing (7)

• CHANGELOG.md
• kinde/management_api/create_identity_response_helpers.go
• kinde/management_api/create_identity_response_test.go
• kinde/management_api/fix_identity_id.go
• kinde/management_api/generate.go
• kinde/management_api/oas_json_gen.go
• kinde/management_api/oas_schemas_gen.go

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[shafaladhikari]

Reviewed and tested on starter kit. Looks good to me.

[victoreronmosele]

This can be closed.

I tried reproducing the bug using the API by creating an identity using an enterprise connection ID, but got back "id" as the parameter instead of "identity_id".