Bug 1614094 [wpt PR 21677] - Encoding: Deflake some web platform tests via sharding...

Bug 1614094 [wpt PR 21677] - Encoding: Deflake some web platform tests via sharding, a=testonly

Automatic update from web-platform-tests
Encoding: Deflake some web platform tests via sharding

encoding/api-invalid-label.any.js had 3287 subtests
encoding/textdecoder-fatal-single-byte.any.js had 7169 subtests

Pragmatically, the encoding tests need to sharded down to 1000
or they flakily timeout (e.g. on win debug and MSAN bots). Apply
that here, and update expectations.

Bug: 862938, 517704
Change-Id: I1b1bd13dd997700791ec25de9d0c75c1e5f72960
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2045144
Reviewed-by: Jarryd Goodman <jarrydg@chromium.org>
Commit-Queue: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740359}

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wpt-commits: 0d81ea137c1b1ff50f188807023e9355f9f38989
wpt-pr: 21677