Auto merge of #21856 - zcorpan:zcorpan/remove-td-th-interfaces, r=jdm

Remove the HTMLTable{Header,Data}CellElement interfaces

Fixes #17222.

<!-- Please describe your changes on the following line: -->
This removes the `HTMLTableHeaderCellElement` and `HTMLTableDataCellElement` interfaces and uses the `HTMLTableCellElement` interface for both `th` and `td` elements, as per the spec.

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #17222.

<!-- Either: -->
- [X] There are tests for these changes OR
- [ ] These changes do not require tests because _____

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/21856)
<!-- Reviewable:end -->

tests/wpt/metadata/custom-elements/builtin-coverage.html.ini

@@ -1,5 +1,4 @@
 [builtin-coverage.html]
-  expected: ERROR
 
   [Untitled]
     expected: FAIL
@@ -385,8 +384,6 @@
     expected: FAIL
   [td: Operator 'new' should instantiate a customized built-in element]
     expected: FAIL
-  [td: document.createElement() should instantiate a customized built-in element]
-    expected: FAIL
   [td: innerHTML should instantiate a customized built-in element]
     expected: FAIL
   [template: Operator 'new' should instantiate a customized built-in element]
@@ -403,8 +400,6 @@
     expected: FAIL
   [th: Operator 'new' should instantiate a customized built-in element]
     expected: FAIL
-  [th: document.createElement() should instantiate a customized built-in element]
-    expected: FAIL
   [th: innerHTML should instantiate a customized built-in element]
     expected: FAIL
   [thead: Operator 'new' should instantiate a customized built-in element]

tests/wpt/metadata/html/dom/historical.html.ini

@@ -3,9 +3,3 @@
   [document.all cannot find applet]
     expected: FAIL
 
-  [HTMLTableHeaderCellElement interface is removed]
-    expected: FAIL
-
-  [HTMLTableDataCellElement interface is removed]
-    expected: FAIL
-

tests/wpt/metadata/html/dom/interfaces.https.html.ini

@@ -2231,12 +2231,6 @@
   [HTMLTableCellElement interface: attribute vAlign]
     expected: FAIL
 
-  [HTMLTableCellElement must be primary interface of document.createElement("td")]
-    expected: FAIL
-
-  [Stringification of document.createElement("td")]
-    expected: FAIL
-
   [HTMLTableCellElement interface: document.createElement("td") must inherit property "headers" with the proper type]
     expected: FAIL
 
@@ -2267,12 +2261,6 @@
   [HTMLTableCellElement interface: document.createElement("td") must inherit property "vAlign" with the proper type]
     expected: FAIL
 
-  [HTMLTableCellElement must be primary interface of document.createElement("th")]
-    expected: FAIL
-
-  [Stringification of document.createElement("th")]
-    expected: FAIL
-
   [HTMLTableCellElement interface: document.createElement("th") must inherit property "headers" with the proper type]
     expected: FAIL
 
@@ -7569,12 +7557,6 @@
   [HTMLTableCellElement interface: attribute vAlign]
     expected: FAIL
 
-  [HTMLTableCellElement must be primary interface of document.createElement("td")]
-    expected: FAIL
-
-  [Stringification of document.createElement("td")]
-    expected: FAIL
-
   [HTMLTableCellElement interface: document.createElement("td") must inherit property "headers" with the proper type]
     expected: FAIL
 
@@ -7605,12 +7587,6 @@
   [HTMLTableCellElement interface: document.createElement("td") must inherit property "vAlign" with the proper type]
     expected: FAIL
 
-  [HTMLTableCellElement must be primary interface of document.createElement("th")]
-    expected: FAIL
-
-  [Stringification of document.createElement("th")]
-    expected: FAIL
-
   [HTMLTableCellElement interface: document.createElement("th") must inherit property "headers" with the proper type]
     expected: FAIL
 

tests/wpt/metadata/html/semantics/interfaces.html.ini

@@ -53,16 +53,3 @@
 
   [Interfaces for SLOT]
     expected: FAIL
-
-  [Interfaces for td]
-    expected: FAIL
-
-  [Interfaces for TD]
-    expected: FAIL
-
-  [Interfaces for th]
-    expected: FAIL
-
-  [Interfaces for TH]
-    expected: FAIL
-