Process "validation error" response from Konnect update API when field of entity is invalid

[randmonkey]

Problem Statement

Currently when an error is returned from Konnect on updating an entity, controller will return error to trigger a requeue of the reconcile request. If the entity is invalid and "validation error" (HTTP status code is 400) is returned, controller will also try to retry to update it.

Proposed Solution

Parse the error returned from Konnect and stop endless requeueing if the error implies that the entity is invalid.
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Additional Information

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Acceptance Criteria

• Can stop requeueing of entities that is rejected by Konnect because its field is invalid

[pmalek]

Created https://github.com/Kong/platform-api/pull/768 to add missing error types.

[pmalek]

This will be solved in KHCP via https://konghq.atlassian.net/browse/KHCP-13816