test: add API sample data for Steering and Tank

tests/json/steering-api-v1-playout.json

+[
+    {
+       "id":17,
+       "start":"2023-05-16T10:06:00",
+       "end":"2023-05-16T10:10:00",
+       "title":"Music Show",
+       "schedule_id":17,
+       "is_repetition":false,
+       "playlist_id":1,
+       "schedule_default_playlist_id":null,
+       "show_default_playlist_id":null,
+       "show_id":1,
+       "show_name":"Musikprogramm",
+       "show_hosts":"Musikredaktion",
+       "show_type":"Unmoderiertes Musikprogramm",
+       "show_categories":"",
+       "show_topics":"",
+       "show_musicfocus":"",
+       "show_languages":"",
+       "show_fundingcategory":"Standard",
+       "memo":"",
+       "className":"default"
+    },
+    {
+       "id":18,
+       "start":"2023-05-16T13:00:00",
+       "end":"2023-05-16T13:05:00",
+       "title":"Musikprogramm",
+       "schedule_id":18,
+       "is_repetition":false,
+       "playlist_id":1,
+       "schedule_default_playlist_id":null,
+       "show_default_playlist_id":null,
+       "show_id":1,
+       "show_name":"Musikprogramm",
+       "show_hosts":"Musikredaktion",
+       "show_type":"Unmoderiertes Musikprogramm",
+       "show_categories":"",
+       "show_topics":"",
+       "show_musicfocus":"",
+       "show_languages":"",
+       "show_fundingcategory":"Standard",
+       "memo":"",
+       "className":"default"
+    }
+ ]
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tests/json/tank-api-v1-playlists-1.json

+{
+    "id":1,
+    "created":"2023-02-28T15:25:38.684803+01:00",
+    "updated":"2023-02-28T15:25:38.684803+01:00",
+    "description":"test",
+    "playout-mode":"linear",
+    "show":"musikprogramm",
+    "entries":[
+       {
+          "uri":"file://musikprogramm/2",
+          "duration":199040000000,
+          "file":{
+             "id":2,
+             "created":"2023-02-28T14:42:09.540485+01:00",
+             "updated":"2023-02-28T14:42:17.564099+01:00",
+             "show":"musikprogramm",
+             "source":{
+                "uri":"upload://some-audio-file.flac",
+                "hash":"sha256:b4e1922bad633ff0e11f55611f04cb3807d15d70bb09969d2b324373af47b574",
+                "import":{
+                   "state":"done"
+                }
+             },
+             "metadata":{
+                "artist":"Test Artist",
+                "title":"Test Track Title",
+                "album":"Test Album"
+             },
+             "size":36496517,
+             "duration":199040000000
+          }
+       }
+    ]
+ }
\ No newline at end of file