Revert "CI: remove corstone1000 job configs temporarily"

This reverts commit f00483b03d11877339c1c1879ba40a62678a080b.

Signed-off-by: Antonio de Angelis <antonio.deangelis@arm.com>
Change-Id: I2047db9ba5b5938bcfb84f31289059fd647e64a8
diff --git a/tf-m-build-and-test.yaml b/tf-m-build-and-test.yaml
index 26a0728..926a956 100644
--- a/tf-m-build-and-test.yaml
+++ b/tf-m-build-and-test.yaml
@@ -25,7 +25,7 @@
       - string:
           name: 'FILTER_GROUP'
           # TODO once available, use a group that filters to configurations we want
-          default: 'pp_test'
+          default: 'pp_test pp_corstone1000'
           description: |
             Filter to a group of configurations as recognised by configs.py
       - string: