Kill PDT.round tests ported to Test262

[jessealama]

No description provided.

[jessealama]

Corresponds to this Test262 PR.

[codecov]

Codecov Report

Merging #2139 (c2fd6a5) into main (01714a5) will decrease coverage by 8.28%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2139      +/-   ##
==========================================
- Coverage   92.28%   84.00%   -8.29%     
==========================================
  Files          19       17       -2     
  Lines       10905    10886      -19     
  Branches     1583     1385     -198     
==========================================
- Hits        10064     9145     -919     
- Misses        827     1708     +881     
- Partials       14       33      +19     

Flag	Coverage Δ
test262	?
tests	84.00% <ø> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
polyfill/lib/plainyearmonth.mjs	26.04% <0.00%> (-41.92%)	⬇️
polyfill/lib/plainmonthday.mjs	51.06% <0.00%> (-31.92%)	⬇️
polyfill/lib/plaintime.mjs	32.17% <0.00%> (-26.94%)	⬇️
polyfill/lib/plaindate.mjs	63.56% <0.00%> (-21.19%)	⬇️
polyfill/lib/plaindatetime.mjs	78.29% <0.00%> (-14.33%)	⬇️
polyfill/lib/instant.mjs	84.79% <0.00%> (-9.46%)	⬇️
polyfill/lib/now.mjs	91.22% <0.00%> (-8.78%)	⬇️
polyfill/lib/timezone.mjs	85.35% <0.00%> (-8.29%)	⬇️
polyfill/lib/zoneddatetime.mjs	91.28% <0.00%> (-7.23%)	⬇️
polyfill/lib/duration.mjs	90.35% <0.00%> (-5.32%)	⬇️
... and 6 more

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[ptomato]

Updated this with the test262 commit.