[svt] Extract timestamp and thumbnail in more cases (ytdl-org#27130)

Add timestamp, set to "valid from" which i think could been seen as publish time.
Add thumbnail in more cases, seems to was only done in the embedded data case for some reason.
Switch svtplay test url to an existing video and also one with no expire date.
Also add an additional thumbnail url test regex.

youtube_dl/extractor/svt.py

@@ -9,6 +9,7 @@
     determine_ext,
     dict_get,
     int_or_none,
+    unified_timestamp,
     str_or_none,
     strip_or_none,
     try_get,
@@ -44,7 +45,8 @@ def _extract_video(self, video_info, video_id):
                     'format_id': player_type,
                     'url': vurl,
                 })
-        if not formats and video_info.get('rights', {}).get('geoBlockedSweden'):
+        rights = try_get(video_info, lambda x: x['rights'], dict) or {}
+        if not formats and rights.get('geoBlockedSweden'):
             self.raise_geo_restricted(
                 'This video is only available in Sweden',
                 countries=self._GEO_COUNTRIES)
@@ -70,6 +72,7 @@ def _extract_video(self, video_info, video_id):
         episode = video_info.get('episodeTitle')
         episode_number = int_or_none(video_info.get('episodeNumber'))
 
+        timestamp = unified_timestamp(rights.get('validFrom'))
         duration = int_or_none(dict_get(video_info, ('materialLength', 'contentDuration')))
         age_limit = None
         adult = dict_get(
@@ -84,6 +87,7 @@ def _extract_video(self, video_info, video_id):
             'formats': formats,
             'subtitles': subtitles,
             'duration': duration,
+            'timestamp': timestamp,
             'age_limit': age_limit,
             'series': series,
             'season_number': season_number,
@@ -141,21 +145,30 @@ class SVTPlayIE(SVTPlayBaseIE):
                     )
                     '''
     _TESTS = [{
-        'url': 'http://www.svtplay.se/video/5996901/flygplan-till-haile-selassie/flygplan-till-haile-selassie-2',
-        'md5': '2b6704fe4a28801e1a098bbf3c5ac611',
+        'url': 'https://www.svtplay.se/video/26194546/det-har-ar-himlen',
+        'md5': '2382036fd6f8c994856c323fe51c426e',
         'info_dict': {
-            'id': '5996901',
+            'id': 'jNwpV9P',
             'ext': 'mp4',
-            'title': 'Flygplan till Haile Selassie',
-            'duration': 3527,
-            'thumbnail': r're:^https?://.*[\.-]jpg$',
+            'title': 'Det h\xe4r \xe4r himlen',
+            'timestamp': 1586044800,
+            'upload_date': '20200405',
+            'duration': 3515,
+            'thumbnail': r're:^https?://(?:.*[\.-]jpg|www.svtstatic.se/image/.*)$',
             'age_limit': 0,
             'subtitles': {
                 'sv': [{
-                    'ext': 'wsrt',
+                    'ext': 'vtt',
                 }]
             },
         },
+        'params': {
+            'format': 'bestvideo',
+            # skip for now due to download test asserts that segment is > 10000 bytes and svt uses
+            # init segments that are smaller
+            # AssertionError: Expected test_SVTPlay_jNwpV9P.mp4 to be at least 9.77KiB, but it's only 864.00B
+            'skip_download': True,
+        },
     }, {
         # geo restricted to Sweden
         'url': 'http://www.oppetarkiv.se/video/5219710/trollflojten',
@@ -236,7 +249,10 @@ def _real_extract(self, url):
                  r'["\']svtId["\']\s*:\s*["\']([\da-zA-Z-]+)'),
                 webpage, 'video id')
 
-        return self._extract_by_video_id(svt_id, webpage)
+        info_dict = self._extract_by_video_id(svt_id, webpage)
+        info_dict['thumbnail'] = thumbnail
+
+        return info_dict
 
 
 class SVTSeriesIE(SVTPlayBaseIE):