This is a PARTIAL reland of 8d094249
Only land the newly added tests files

Original change's description:
> [Intl] Validate u extension type
>
> Fix intl402/*/ignore-invalid-unicode-ext-values
> Add tests for other valid/invalid -u- ext values.
>
> Bug: v8:7481
> Change-Id: I429effd071bb03599a1e767bb2a9e9918a91b850
> Reviewed-on: https://chromium-review.googlesource.com/c/1351307
> Commit-Queue: Frank Tang <ftang@chromium.org>
> Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#58173}

Bug: v8:7481
Change-Id: I0a1c5701ade330026e2cf7eb554c6390b048a68d
Reviewed-on: https://chromium-review.googlesource.com/c/1396737Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58604}

This reverts commit 8d094249.

Reason for revert: Cause Memory regression

TBR=gsathya@chromium.org

Original change's description:
> [Intl] Validate u extension type
>
> Fix intl402/*/ignore-invalid-unicode-ext-values
> Add tests for other valid/invalid -u- ext values.
>
> Bug: v8:7481
> Change-Id: I429effd071bb03599a1e767bb2a9e9918a91b850
> Reviewed-on: https://chromium-review.googlesource.com/c/1351307
> Commit-Queue: Frank Tang <ftang@chromium.org>
> Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#58173}

TBR=cira@chromium.org,jshin@chromium.org,gsathya@chromium.org,ftang@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: v8:7481
Change-Id: Idabf2183684f264271ebe2b8c0ca10ae8e30d811
Reviewed-on: https://chromium-review.googlesource.com/c/1393499Reviewed-by: Frank Tang <ftang@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58506}

Fix intl402/*/ignore-invalid-unicode-ext-values
Add tests for other valid/invalid -u- ext values.

Bug: v8:7481
Change-Id: I429effd071bb03599a1e767bb2a9e9918a91b850
Reviewed-on: https://chromium-review.googlesource.com/c/1351307
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58173}

This reverts commit d37f6fd6.

Reason for revert:
https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Linux%20-%20gc%20stress/19643

Original change's description:
> [Intl] Handle invalid values in locale
> 
> Fix the bug that we call setKeywordValue w/o convert the key to legacy key.
> 
> Bug: v8:7481
> Change-Id: I5a743e41d02b64385c5050fc1d83279741e24659
> Reviewed-on: https://chromium-review.googlesource.com/c/1339243
> Commit-Queue: Frank Tang <ftang@chromium.org>
> Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
> Reviewed-by: Jungshik Shin <jshin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#57886}

TBR=jshin@chromium.org,gsathya@chromium.org,ftang@chromium.org

Change-Id: I3765eed7a9bdf123321c6d0589dfb72ab8ae2b2f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7481
Reviewed-on: https://chromium-review.googlesource.com/c/1352284Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57888}

Fix the bug that we call setKeywordValue w/o convert the key to legacy key.

Bug: v8:7481
Change-Id: I5a743e41d02b64385c5050fc1d83279741e24659
Reviewed-on: https://chromium-review.googlesource.com/c/1339243
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Jungshik Shin <jshin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57886}