meson: Add test setup for easier valgrind test

Add meson test setup in order to make meson test
equivalent to "make {test}.valgrind" when valgrind was enabled.
To enable valgrind test setup, specify "--setup=valgrind"
22 jobs for enable-meson-test-valgrind in 42 minutes and 56 seconds (queued for 4 seconds)
latest
Status Job ID Name Coverage
  Preparation
passed #463789
gst indent

00:00:39

passed #463788
manifest

00:00:39

 
  Build
passed #463795
build cerbero android universal

00:11:56

passed #463796
build cerbero cross win32

00:10:38

passed #463797
build cerbero cross win64

00:06:40

passed #463794
build cerbero fedora x86_64

00:07:20

manual #463799
gst-ios-12.2 allowed to fail manual
build cerbero ios universal
passed #463798
gst-macos-10.14
build cerbero macos x86_64

00:06:49

passed #463790
build fedora x86_64

00:10:18

passed #463791
build nodebug fedora x86_64

00:09:15

passed #463792
build static fedora x86_64

00:13:55

passed #463793
build static nodebug fedora x86_64

00:12:14

 
  Test
passed #463800
check fedora

00:05:15

passed #463801
integration testsuites fedora

00:14:56

passed #463806
valgrind bad

00:08:22

passed #463803
valgrind base

00:12:13

passed #463802
valgrind core

00:15:23

passed #463807
valgrind ges

00:13:55

passed #463804
valgrind good

00:17:33

passed #463805
valgrind ugly

00:02:41

 
  Integrate
passed #463808
android universal examples

00:06:23

passed #463809
documentation

00:03:23