Fix the CI failures of the runner and test its planner, options and analysis

ExtraTests X21 and X27 defined their listeners at namespace scope, which
clang rejects under -Wweak-vtables with -Werror on Linux and macOS; they
are now in anonymous namespaces.

After a fatal signal Catch2 closes the open sections itself, so on POSIX a
crash was reported outside the section it happened in. The scheduler now
ignores section ends that follow a fatal condition.

New unit tests cover the planner (every selection, dependency closure and
cycles, hash and duration shards, incremental runs, learned time limits,
ordering, retries, quarantine and replay), every command-line option and
its errors, and the failure analysis (history classes, signature groups,
crash and hang locations, changed files, replay commands).
Catalog::FromEntries builds a catalog without a test registry so the
planner can be tested on its own.

1 files changed, 2 insertions, 0 deletions

diff --git a/tests/ExtraTests/X21-PartialTestCaseEvents.cpp b/tests/ExtraTests/X21-PartialTestCaseEvents.cpp
index c55f6c2b..99002822 100644
--- a/tests/ExtraTests/X21-PartialTestCaseEvents.cpp
+++ b/tests/ExtraTests/X21-PartialTestCaseEvents.cpp
@@ -28,6 +28,7 @@
 using Catch::TestCaseInfo;
 using Catch::TestCaseStats;
 
+namespace {
 class PartialListener : public Catch::EventListenerBase {
 public:
     using EventListenerBase::EventListenerBase;
@@ -58,6 +59,7 @@ public:
 private:
     std::string m_events;
 };
+} // namespace
 
 CATCH_REGISTER_LISTENER(PartialListener)