Unparallelize IO heavy tests

Alternative to phpGH-10892. This is somewhat unfortunate since these are also the
slow tests. I'm also not sure if this actually helps.

Author: iluuu1994

ext/mysqli/tests/mysqli_fetch_array_large.phpt

@@ -7,6 +7,8 @@ mysqli
 if (getenv("SKIP_SLOW_TESTS")) die("skip slow test");
 require_once('skipifconnectfailure.inc');
 ?>
+--CONFLICTS--
+all
 --INI--
 memory_limit=-1
 --FILE--

ext/mysqli/tests/mysqli_stmt_bind_limits.phpt

@@ -6,6 +6,8 @@ mysqli
 <?php
 require_once('skipifconnectfailure.inc');
 ?>
+--CONFLICTS--
+all
 --FILE--
 <?php
     require_once("connect.inc");

ext/oci8/tests/CONFLICTS

@@ -1 +1,2 @@
-oci8
+# OCI tests are network intensive and may cause timeouts in other tests
+all

ext/pdo_oci/tests/CONFLICTS

@@ -1 +1,2 @@
-oci8
+# OCI tests are network intensive and may cause timeouts in other tests
+all

ext/standard/tests/file/bug81145.phpt

@@ -13,6 +13,8 @@ if (PHP_OS_FAMILY !== "Windows") {
     @unlink(__DIR__ . "/bug81145_src.bin");
 }
 ?>
+--CONFLICTS--
+all
 --FILE--
 <?php
 $src = __DIR__ . "/bug81145_src.bin";

ext/tidy/tests/parsing_file_too_large.phpt

@@ -8,6 +8,8 @@ if (PHP_INT_SIZE != 8) die("skip this test is for 64bit platform only");
 if (getenv("SKIP_SLOW_TESTS")) die("skip slow test");
 if (getenv("SKIP_ASAN")) die("skip too big for asan");
 ?>
+--CONFLICTS--
+all
 --INI--
 memory_limit="5G"
 --FILE--

sapi/cli/tests/upload_2G.phpt

@@ -42,6 +42,8 @@ if (getenv('SKIP_PERF_SENSITIVE')) {
     die("skip Test may be very slow if PHP is instrumented");
 }
 ?>
+--CONFLICTS--
+all
 --FILE--
 <?php