[ssci] Add Shipped field and update NOT_SHIPPED uses

This CL adds the Shipped field to README files. See the LSC
doc at go/lsc-chrome-metadata. Any uses of NOT_SHIPPED are also removed.

These files were originally missed in the main LSC effort due to:
* NOT_SHIPPED was in the Description field (harmless but updated anyway)
* Casing of field was off ("License file" instead of "License File")
* //third_party/node/README.chromium has multiple packages' metadata, so only the first package's metadata had been updated in the initial effort
* not a README.chromium file (README_GardinerMod.txt)

Bug: b:285450740
Change-Id: I9e74d6f6b3c92faa0e5a675086142f4ed9fa4a9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4764184
Reviewed-by: Patrick Meiring <meiring@google.com>
Owners-Override: Anne Redulla <aredulla@google.com>
Commit-Queue: Anne Redulla <aredulla@google.com>
Cr-Commit-Position: refs/heads/main@{#1181249}
GitOrigin-RevId: 8f7bff1f57548177f2c632411bbfbcbf7793c6df
1 file changed