Hotfix(devel): config: Drop incorrect assertion of yk8s.k8s-service-layer.vault.s3_config_file

Version Control Information

Source branch: hotfix/devel/config-drop-incorrect-assertion-of-yk8s-k8s-service-layer-vault-s3_config_file Target branch: devel

Commits:

* config: Drop incorrect assertion of `yk8s.k8s-service-layer.vault.s3_config_file`

`config.yk8s.k8s-service-layer.vault.s3_config_file` was forced to be set when
 `config.yk8s.k8s-service-layer.vault.enabled = true` which is undesired because
 the config option is only intended for temporary use while uploading the
 configured file to the Vault backend.

Fixes: #803

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Part-of: #803 (closed)
Related-hotfix: !1972 (closed) (v10.0)

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