LibWeb+WebContent: Do not include DOM HTML in text test expectations

For example, in the following abbreviated test HTML:

    <span>some text</span>
    <script>println("whf")</script>

We would have to craft the expectation file to include the "some text"
segment, usually with some leading whitespace. This is a bit annoying,
and makes it difficult to manually craft expectation files.

So instead of comparing the expectation against the entire DOM inner
text, we now send the inner text of just the <pre> element containing
the test output when we invoke `internals.signalTextTestIsDone`.

Tests/LibWeb/Text/expected/WebAnimations/animation-properties/currentTime.txt

@@ -1,4 +1,4 @@
-   Animation with no timeline has null currentTime: true
+Animation with no timeline has null currentTime: true
 Animation that hasn't been played has null currentTime: true
 Played animation has a currentTime of 0: true
 Animation time after 100ms is correct

Tests/LibWeb/Text/expected/WebAnimations/animation-properties/effect.txt

@@ -1,4 +1,4 @@
-   Element.animate creates Animation with effect: true
+Element.animate creates Animation with effect: true
 Setting effect to null clears the effect: true
 Accessing effect property on animation with no effect produces null: true
 Setting effect on animation with no effect works: true

Tests/LibWeb/Text/expected/WebAnimations/animation-properties/finished.txt

@@ -1,4 +1,4 @@
-   finished promise remains after finishing: true
+finished promise remains after finishing: true
 finished promise updates after playing: true
 cancel() updates finished promise: true
 Expected finished promise cancellation

Tests/LibWeb/Text/expected/WebAnimations/animation-properties/pending-and-ready.txt

@@ -1,4 +1,4 @@
-   Animation is pending after a call to play(): true
+Animation is pending after a call to play(): true
 Animation is not pending after ready promise resolves: true
 Animation is pending after a call to pause(): true
 Animation is not pending after ready promise resolves: true

Tests/LibWeb/Text/expected/WebAnimations/animation-properties/playState.txt

@@ -1,4 +1,4 @@
-   Animation's playState is idle after cancel(): true
+Animation's playState is idle after cancel(): true
 Animation's playState is idle immediately after play(): true
 Animation's playState is paused after pause(): true
 Animation's playState is finished after finish(): true

Tests/LibWeb/Text/expected/WebAnimations/animation-properties/playbackRate.txt

@@ -1,4 +1,4 @@
-   Animation has expected currentTime value after 100ms
+Animation has expected currentTime value after 100ms
 Animation has expected currentTime value after 200ms
 Animation has expected currentTime value after 300ms
 Animation has expected currentTime value after 400ms

Tests/LibWeb/Text/expected/WebAnimations/animation-properties/replaceState.txt

@@ -1,4 +1,4 @@
-   Animation's replaceState is active initially: true
+Animation's replaceState is active initially: true
 Animation's replaceState is active after finishing: true
 Animation's replaceState is not removed after creating new animation: true
 Animation's replaceState is removed after new animation finishes: true

Tests/LibWeb/Text/expected/WebAnimations/animation-properties/startTime.txt

@@ -1,4 +1,4 @@
-   Animation's startTime is initially null: true
+Animation's startTime is initially null: true
 Animation's startTime is 100 after setting the value: true
 Animation's startTime is non-null after ready promise resolved: true
 Animation's startTime is null after calling cancel(): true

Tests/LibWeb/Text/expected/WebAnimations/animation-properties/timeline.txt

@@ -1,2 +1,2 @@
-   Animation's default timeline is the document's timeline: true
+Animation's default timeline is the document's timeline: true
 Animation created with null timeline has no timeline: true