Explicitly disable 3PCD in settings page tests that are for pre-3PCD

- All components should have pre- and post-3PCD coverage (I have added
some more for post-3PCD)
- 3PCD state shouldn't matter for other test cases

Here is a link to how fieldtrial_testing_config works:
go/finch-fieldtrial-testing-config#effect-of-field-trial-testing-configs
When we enable 3PCD in fieldtrial_testing_config we will get coverage
for every code path with 3PCD on and off. So the explicit test cases
we need are just for those that test explicit behavior that is only for
pre- or post- 3PCD

Bug: b:306414714
Change-Id: Ia057128a6e4984f4b99feea4b88e226014c1fba0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5014144
Commit-Queue: Theodore Olsauskas-Warren <sauski@google.com>
Auto-Submit: Fiona Macintosh <fmacintosh@google.com>
Reviewed-by: Theodore Olsauskas-Warren <sauski@google.com>
Cr-Commit-Position: refs/heads/main@{#1224274}