Auto merge of #22005 - ferjm:media.timeline, r=ceyusa

Basic HTMLMediaElement seeking

- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #21998

This allows media seeking only when the server supports byte-range requests.

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tests/wpt/metadata/html/semantics/embedded-content/media-elements/offsets-into-the-media-resource/currentTime.html.ini

@@ -1,15 +0,0 @@
-[currentTime.html]
-  type: testharness
-  expected: TIMEOUT
-  [currentTime initial value]
-    expected: FAIL
-
-  [setting currentTime with a media controller present]
-    expected: FAIL
-
-  [setting currentTime when readyState is HAVE_NOTHING]
-    expected: FAIL
-
-  [setting currentTime when readyState is greater than HAVE_NOTHING]
-    expected: TIMEOUT
-

tests/wpt/metadata/html/semantics/embedded-content/media-elements/seeking/seek-to-currentTime.html.ini

@@ -1,6 +1,5 @@
 [seek-to-currentTime.html]
   type: testharness
-  expected: TIMEOUT
   [seek to currentTime]
-    expected: TIMEOUT
+    expected: FAIL
 

tests/wpt/metadata/html/semantics/embedded-content/media-elements/seeking/seek-to-max-value.htm.ini

@@ -1,6 +1,5 @@
 [seek-to-max-value.htm]
   type: testharness
-  expected: TIMEOUT
   [seek to Number.MAX_VALUE]
-    expected: TIMEOUT
+    expected: FAIL
 

tests/wpt/metadata/html/semantics/embedded-content/media-elements/seeking/seek-to-negative-time.htm.ini

@@ -1,6 +1,5 @@
 [seek-to-negative-time.htm]
   type: testharness
-  expected: TIMEOUT
   [seek to negative time]
-    expected: TIMEOUT
+    expected: FAIL