Records telemetry for the settings used with Content Analysis. Note
that there is no way in C++ to get the default value of a pref that was
set via an Enterprise Policy (with setAndLockPref()) because that method
actually sets the default value, so I had to modify some of my plans for
telemetry to gather. For example, I was going to record interception points
whose Enabled value differed from the default, but instead we record
any interception points whose Enabled value is false. (right now these
are equivalent, but Downloads will be default-off so this will change)
For the allow/deny URL lists I didn't want to record the actual URLs
on those lists, so we really do want to just record whether the values
are different from the default. I hard-coded the default into
ContentAnalysis.cpp, and we can rely on the JS test
test_ca_enterprise_config_with_default_prefs_telemetry() to start failing
if that changes.
Also adds a forceRecreateClientForTest() method to ContentAnalysis that
tests can use to force trying to connect to a client. (since this is when
we record the settings telemetry)
Original Revision: https://phabricator.services.mozilla.com/D252570
Differential Revision: https://phabricator.services.mozilla.com/D258214
0acca0e06b