Base+Utilities: Add run-tests program to run system tests with LibTest

This test program heavily pulls from the JavaScriptTestRunner/test-js,
but with a twist. Instead of loading JavaScript files into the current
process, constructing a JS environment for them, and executing test
suites/tests directly, run-tests posix_spawns each test file.

Test file stdout is written to a temp file, and only dumped to console
if the test fails or the verbose option is passed to the program. Unlike
test-js, times are always printed for every test executed for better
visibility in CI.

Base/home/anon/tests/run-tests-and-shutdown.sh

@@ -3,54 +3,8 @@
 echo
 echo "==== Running Tests on SerenityOS ===="
 
-run(index) {
-    shift
-    test_dir=$(dirname $1)
-    if test -z $test_dir {
-        test_dir="."
-    }
-    test_cmd=($*)
-    echo "==== Running test $index out of $count_of_all_tests -- $test_cmd ===="
-    echo "::group::$test_cmd"
-    cd $test_dir
-    if $test_cmd {
-        echo "::endgroup::"
-        echo "==== $test_cmd passed! ===="
-    } else {
-        echo "::endgroup::"
-        failed_tests=${concat_lists $failed_tests ($test_cmd)}
-        echo "==== Added $test_cmd to list of failed tests. Failed tests so far: $failed_tests ===="
-        echo "::error file=$test_cmd:: $test_cmd returned non-zero exit code, check logs!"
-    }
-    cd -
-}
-
-# Files in /usr/Tests/* that we don't want to execute match these patterns:
-#     Kernel/Legacy: Kernel tests that are either old patched exploits, or hang the system/shell
-#     .inc: Shell test helper file that's not a test
-#     UserEmulator: Tests designed to run inside the Userspace Emulator
-#     stack-smash: Intentionally crashes by smashing the stack
-#     .frm,.txt: Test inputs that are not tests
-#     test-web: Requires the window server in order to work
-#     test-js: We start this one manually with the show progress flag set to false
-exclude_patterns='Kernel/Legacy|.inc|UserEmulator|stack-smash|.txt|.frm|test-web|test-js'
-
-system_tests=((test-js --show-progress=false) (test-crypto -c -t test))
-all_tests=${concat_lists $system_tests $(find /usr/Tests -type f | grep -E -v $exclude_patterns | shuf) }
-count_of_all_tests=${length $all_tests}
-failed_tests=()
-
-for index i cmd in $all_tests {
-    run $(expr $i + 1) $cmd
-}
-
-fail_count=${length $failed_tests}
-
-echo "==== Out of $count_of_all_tests tests, $(expr $count_of_all_tests - $fail_count) passed and $fail_count failed. ===="
-
-if test $fail_count -gt 0 {
-    echo "==== Failing tests: $failed_tests ===="
-}
+run-tests
+fail_count=$?
 
 echo "Failed: $fail_count" > ./test-results.log