BUGFIX: Handle PSR-7 ApiException responses

[erkenes]

• handle PSR-7 ResponseInterface responses
• extract the response body when available (falling back to string cast)
• log errors for both associative array and stdClass

[erkenes]

This PR includes the bugfix from #54 and #55

json_decode(): Argument #1 ($json) must be of type string, GuzzleHttp\Psr7\Response given

but also fixes an issue with the logging

Warning: Attempt to read property "error" on array in /data/Data/Temporary/Development/SubContextDocker/SubContextCli/Cache/Code/Flow_Object_Classes/Flowpack_ElasticSearch_ContentRepositoryQueueIndexer_UpdateAliasJob.php line 143

[erkenes]

I'm using OpenSearch, and this error can occur if, for example, the index permissions are not configured correctly.
I've corrected the permissions now, but the error should still be handled properly.

This is a working role configuration in OpenSearch:

foobar_neos:
  reserved: false
  hidden: false
  cluster_permissions:
    - "cluster_manage_index_templates"
    - "indices:data/write/bulk"
  index_permissions:
    - index_patterns:
        - "foobar_neos*"
        - "*_foobar_neos_*"
      dls: ""
      fls: []
      masked_fields: []
      allowed_actions:
        - "indices_all"
        - "indices:admin/delete" # required to delete old indices
    - index_patterns:
        - "*" # the allowed-actions are not working with the index-pattern above
      dls: ""
      fls: []
      masked_fields: []
      allowed_actions:
        - "indices:admin/aliases/get" # required to check if the alias is mapped to an index
        - "indices:monitor/stats" # required to fetch old indices and delete them
  tenant_permissions: []
  static: false