Auto merge of #29667 - Loirooriol:test-failures, r=mrobinson

Expect some tests to fail in layout-2020

sslfail.html and websocket_disconnect.html are already expected to fail in layout-2013.

text-indent-percentage-001.xht and text-indent-tab-positions-001.html fail in layout-2020 due to lack of support for text-indent and tabs.

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] These changes fix #___ (GitHub issue number if applicable)

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- [ ] There are tests for these changes OR
- [X] These changes do not require tests because they are just updating test expectations.

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tests/wpt/metadata-layout-2020/css/css-text/text-indent/text-indent-percentage-001.xht.ini

@@ -0,0 +1,2 @@
+[text-indent-percentage-001.xht]
+  expected: FAIL

tests/wpt/metadata-layout-2020/css/css-text/text-indent/text-indent-tab-positions-001.html.ini

@@ -0,0 +1,2 @@
+[text-indent-tab-positions-001.html]
+  expected: FAIL

tests/wpt/mozilla/meta-layout-2020/mozilla/sslfail.html.ini

@@ -0,0 +1,3 @@
+[sslfail.html]
+  type: reftest
+  disabled: https://github.com/servo/servo/issues/10760

tests/wpt/mozilla/meta-layout-2020/mozilla/websocket_disconnect.html.ini

@@ -0,0 +1,4 @@
+[websocket_disconnect.html]
+  expected: ERROR
+  [Web socket doesn't panic when worker disappears]
+    expected: TIMEOUT