PHP 8.5: Fatal errors now have stack traces

Xdebug has always had these in develop mode, which wasn't turned on for these
tests. We we enable them so that the test has the same out for all supported
PHP versions.

Author: derickr

tests/coverage/bug00318.phpt

@@ -1,7 +1,7 @@
 --TEST--
 Test for bug #318: Segmentation Fault in code coverage analysis
 --INI--
-xdebug.mode=coverage
+xdebug.mode=develop,coverage
 --FILE--
 <?php
 // Run me from the PHP CLI
@@ -12,3 +12,5 @@ xdebug_stop_code_coverage();
 ?>
 --EXPECTF--
 Fatal error: %sbreak%s in %sbug00318.inc on line 3
+
+Call Stack:%A

tests/coverage/bug00670.phpt

@@ -1,7 +1,7 @@
 --TEST--
 Test for bug #670: Xdebug crashes with broken "break x" code
 --INI--
-xdebug.mode=coverage
+xdebug.mode=develop,coverage
 --FILE--
 <?php
 xdebug_start_code_coverage( XDEBUG_CC_DEAD_CODE | XDEBUG_CC_UNUSED );
@@ -10,3 +10,5 @@ echo "OK\n";
 ?>
 --EXPECTF--
 Fatal error: Cannot 'break' 2 levels in %s670-ConsistentHashing.inc on line 146
+
+Call Stack:%A