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Make the TestCertificateProviderExtension's test extension have a fixed
extension ID (by putting its public key into the manifest.json file),
and update the class to expose this ID as a constant.

This is a preparation step for getting rid of the
TestCertificateProviderExtensionLoginScreenMixin (in favor of
ExtensionForceInstallMixin).

Bug: 1090941
Change-Id: Ic27ed9f0161631b6415a07d3a8e73b8329ec34eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2312817
Commit-Queue: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Fabian Sommer <fabiansommer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791055}