Bug 1838986 [wpt PR 40606] - Move CustomElementRegistry.getName() tes…

…ts to a tentative test file, a=testonly

Automatic update from web-platform-tests
Move CustomElementRegistry.getName() tests to a tentative test file

The spec change [1] hasn't landed yet, so the tests can only be
tentative.

This also prevents affecting interop2023 [2].

[1] whatwg/html#9195
[2] web-platform-tests/interop#358

Bug: 1435389
Change-Id: I1e35d7f06bcf2b005304cdc182a67cfa69b74de1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4621660
Auto-Submit: Xiaocheng Hu <xiaochenghchromium.org>
Reviewed-by: Mason Freed <masonfchromium.org>
Commit-Queue: Xiaocheng Hu <xiaochenghchromium.org>
Cr-Commit-Position: refs/heads/main{#1160209}

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wpt-commits: 99ee1f53f877610adf1f29399ea9660905e6d7a9
wpt-pr: 40606

UltraBlame original commit: ff55e5770af6e99f114c0593f02f296318fa584f