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Similar to ExtensionManagement::IsInstallationExplicitlyAllowed,
IsInstallationExplicitlyBlocked return true only if an extension's
installation is blocked by its id but not wildcard.

This function is going to be used by extension request feature. With it,
user can send extension install request to admin. Only extensions that
are not explicily blocked can be requested.

Bug: 1006899
Change-Id: I6160fee3ab25f4da095b51bd727fe53fb3b8760c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863635
Commit-Queue: Owen Min <zmin@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706918}