Fix tests of YoutubePlaylistExtractorTest and YoutubeMixPlaylistExtractorTest

Without removing RunWith and SuiteClasses annotations (and the corresponding imports) in YoutubePlaylistExtractorTest and YoutubeMixPlaylistExtractorTest, some mocks cannot be generated, so the CI fails because of the missing mocks. Mocks of workings tests have been also updated.

extractor/src/test/resources/org/schabi/newpipe/extractor/services/youtube/extractor/mix/invalid/generated_mock_1.json

@@ -0,0 +1,242 @@
+{
+  "request": {
+    "httpMethod": "POST",
+    "url": "https://www.youtube.com/youtubei/v1/next?key\u003dAIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8",
+    "headers": {
+      "Accept-Language": [
+        "en-GB, en;q\u003d0.9"
+      ],
+      "Origin": [
+        "https://www.youtube.com"
+      ],
+      "X-YouTube-Client-Name": [
+        "1"
+      ],
+      "Referer": [
+        "https://www.youtube.com"
+      ],
+      "X-YouTube-Client-Version": [
+        "2.20210728.00.00"
+      ]
+    },
+    "dataToSend": [
+      123,
+      34,
+      112,
+      108,
+      97,
+      121,
+      108,
+      105,
+      115,
+      116,
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+      100,
+      34,
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+      34,
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+      100,
+      101,
+      34,
+      44,
+      34,
+      99,
+      111,
+      110,
+      116,
+      101,
+      120,
+      116,
+      34,
+      58,
+      123,
+      34,
+      99,
+      108,
+      105,
+      101,
+      110,
+      116,
+      34,
+      58,
+      123,
+      34,
+      104,
+      108,
+      34,
+      58,
+      34,
+      101,
+      110,
+      45,
+      71,
+      66,
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+      34,
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+      34,
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+      49,
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+      55,
+      50,
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+      99,
+      100,
+      101,
+      34,
+      125
+    ],
+    "localization": {
+      "languageCode": "en",
+      "countryCode": "GB"
+    }
+  },
+  "response": {
+    "responseCode": 500,
+    "responseMessage": "",
+    "responseHeaders": {
+      "alt-svc": [
+        "h3\u003d\":443\"; ma\u003d2592000,h3-29\u003d\":443\"; ma\u003d2592000,h3-T051\u003d\":443\"; ma\u003d2592000,h3-Q050\u003d\":443\"; ma\u003d2592000,h3-Q046\u003d\":443\"; ma\u003d2592000,h3-Q043\u003d\":443\"; ma\u003d2592000,quic\u003d\":443\"; ma\u003d2592000; v\u003d\"46,43\""
+      ],
+      "cache-control": [
+        "private"
+      ],
+      "content-type": [
+        "application/json; charset\u003dUTF-8"
+      ],
+      "date": [
+        "Sun, 01 Aug 2021 15:15:10 GMT"
+      ],
+      "server": [
+        "ESF"
+      ],
+      "vary": [
+        "Origin",
+        "X-Origin",
+        "Referer"
+      ],
+      "x-content-type-options": [
+        "nosniff"
+      ],
+      "x-frame-options": [
+        "SAMEORIGIN"
+      ],
+      "x-xss-protection": [
+        "0"
+      ]
+    },
+    "responseBody": "{\n  \"error\": {\n    \"code\": 500,\n    \"message\": \"Internal error encountered.\",\n    \"errors\": [\n      {\n        \"message\": \"Internal error encountered.\",\n        \"domain\": \"global\",\n        \"reason\": \"backendError\"\n      }\n    ],\n    \"status\": \"INTERNAL\"\n  }\n}\n",
+    "latestUrl": "https://www.youtube.com/youtubei/v1/next?key\u003dAIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8"
+  }
+}