Remove Kyma upgrade capability

[KsaweryZietara]

Description This ticket is an outcome of the TASK.

AC

• [x] 1) Remove /upgrade/kyma endpoint https://github.com/kyma-project/kyma-environment-broker/pull/896
• [x] 2) Remove KymaOrchestrationProcessingQueue with it's steps https://github.com/kyma-project/kyma-environment-broker/pull/900

Docu update:

• [x] 03-20-runtime-operations.md
• [x] docs/contributor/02-50-orchestration.md - (SME @piotrmiskiewicz )
  • [x] docs/contributor/02-70-orchestration-status.md (SME @piotrmiskiewicz )
  • [x] kyma-environment-broker

[PK85]

@KsaweryZietara what will happen now if someone will upgrade Kyma clusters right now? I expect nothing should happen with success.

[KsaweryZietara]

1. /upgrade/kyma endpoint always returns bad request status with message kyma upgrade not supported.
2. Kyma upgrade is not supported in orchestration API.