Bug 1880418 [wpt PR 44600] - Remove undefined aria-label tests., a=testonly

Automatic update from web-platform-tests
Remove undefined aria-label tests. (#44600)

Many ARIA attributes do support a value of "undefined".
However, aria-label expects a string value, which is specified as an "Unconstrained value type."
Thus, "undefined" is not a special value for aria-label, and these tests are incorrect.
--

wpt-commits: 1e5aba72c99ed91ba4f4cf7695f1e231cfe0944a
wpt-pr: 44600

testing/web-platform/tests/accname/name/comp_label.html

@@ -154,13 +154,6 @@
 <textarea aria-label="label" data-expectedlabel="label" data-testname="label valid on textarea element" class="ex">x</textarea>
 <ul aria-label="label" data-expectedlabel="label" data-testname="label valid on list (unordered) element" class="ex">x</ul>
 
-<h2>Undefined aria-label tests</h2>
-<img alt="alt" aria-label="undefined" data-expectedlabel="alt" data-testname="aria-label undefined on img w/ alt" class="ex" />
-<img aria-label="undefined" data-expectedlabel="" data-testname="aria-label undefined on img w/o alt" class="ex" />
-<img alt="" aria-label="undefined" data-expectedlabel="" data-testname="aria-label undefined on img w/ empty alt" class="ex" />
-<img aria-label="undefined" data-expectedlabel="title" data-testname="aria-label undefined on img w/o alt but w/ title" class="ex" />
-<img alt="" aria-label="undefined" data-expectedlabel="title" data-testname="aria-label undefined on img w/ empty alt but w/ title" class="ex" />
-
 <h2>Name computation precedence tests</h2>
 <!-- Name computation: https://w3c.github.io/accname/#computation-steps -->