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This renames "repack_whitelist" to "repack_allowlist" and swaps out
related code (ex. variables in chrome/ layer). The new term is
consistent with "enable_resource_allowlist_generation" and avoids
non-inclusive terminology.

Bug: 1097644
Test: autoninja -C out/Official monochrome_public_apk (official build)
Change-Id: I3e319c8b8bec9ab9df081b0b61ec02683d665af6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2399453Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805426}