Revert "[css-grid] Remove outdated css-grid-layout alignment tests"

This reverts commit 514a76b7b6287b8e34d200cf51e666d3ee32e511.

Reason for revert: This was removing the tests from the wrong location,
it was removing them from WPT folder instead of fast/css-grid-layout/.

Original change's description:
> [css-grid] Remove outdated css-grid-layout alignment tests
>
> The alignment tests in question have been moved from WebKit to WPT
> with the following PR:
> * #19828
> * #20088
> * #19809
> * #19665
> * #20110
>
> The removed tests that are now in WPT can be found under:
> third_party/blink/web_tests/external/wpt/css/css-grid/alignment/
>
> This patch removes the outdated version of the tests from
> third_party/blink/web_tests/fast/css-grid-layout/
>
> Change-Id: I2e5601700332b8fb2e12036f9c45ae7e98bf90b6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1989531
> Commit-Queue: Manuel Rego <rego@igalia.com>
> Reviewed-by: Manuel Rego <rego@igalia.com>
> Cr-Commit-Position: refs/heads/master@{#729346}

TBR=jfernandez@igalia.com,rego@igalia.com,obrufau@igalia.com,rmonteriso@igalia.com

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

Change-Id: I18d98894d82e9800024d0fd23ee11c82432a0e64
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1993801
Reviewed-by: Manuel Rego <rego@igalia.com>
Commit-Queue: Manuel Rego <rego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#729932}