Bug 1639075 [wpt PR 23682] - Reorganize COEP + reporting tests, a=testonly

Bug 1639075 [wpt PR 23682] - Reorganize COEP + reporting tests, a=testonly

Automatic update from web-platform-tests
Reorganize COEP + reporting tests

The COEP reporting feature has two observable effects. User agents send
reports to the network, and web developers can observe reports via
ReportingObserver. We need to have *some* tests for each way, but we
don't need to have all the test cases for both ways.

As the ReportingObserver way is faster, easier to debug and less flaky,
we would like to test more cases with ReportingObserver. This CL moves
many test cases from reporting.https.html to
reporting-navigation.https.html and
reporting-subresource-corp.https.html, and rename reporting.https.html
to reporting-to-endpoint.https.html. This CL also removes many
duplicated tests (see reporting-subresource-corp.https.html).

Bug: 1052764
Change-Id: I37a567d8cbb6aec79a8426f2f32630c70e4da112
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208154
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770058}

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wpt-commits: 9189c2043df0d424d0f9c1689136c45730b35e88
wpt-pr: 23682