Refactor the interactions between Kratos and Login UI

[natalian98]

We need to refactor the interactions between Kratos, Login UI frontend and backend. The reason is that Kratos SDK requires application/json content type, but some flows (identifier first, webauthn) are expected to be form-urlencoded. We should unify the request handling.

See reference: #697 (comment)

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The internal ticket has been created: https://warthogs.atlassian.net/browse/IAM-1682.

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This issue has been marked as stale due to the lack of updates in the last 90 days