fix(workflows): also filter abstract test base classes out of matrix shards (#375)

The "Create Mage-OS testsuite" step already excludes Abstract*Test.php /
*AbstractTest.php files discovered under <directory> entries, but EXCLUSION_LIST
modules (Catalog, Bundle, Sales, AsynchronousOperations) are pre-expanded in
matrix-calculator to comma-separated lists of individual *.php files that land
as <file> entries — bypassing the directory-side filter and tripping PHPUnit 12
"abstract class" runner warnings (exit 1).

Filter at the find(1) call so abstract files never enter the matrix in the
first place. Keeps the directory-side exclude loop authoritative for the
non-EXCLUSION_LIST shards.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: rhoerr

.github/workflows/full-integration-tests.yaml

@@ -115,6 +115,8 @@ jobs:
           
           # Handle exclusion list
           # run over EXCLUSION_LIST, find all "*Test.php" files, and put them in array. Exclude directories.
+          # Skip abstract test base classes (Abstract*Test.php / *AbstractTest.php) — PHPUnit 12
+          # treats loading an abstract class as a runner warning, which produces exit 1.
           EXCLUSION_LIST_FILES=()
           for dir in "${EXCLUSION_LIST[@]}"; do
             while IFS= read -r -d '' file; do
@@ -123,7 +125,8 @@ jobs:
                   continue
                 fi
                 EXCLUSION_LIST_FILES+=("$file")
-            done < <(find "$dir" -mindepth 1 -type f -name '*Test.php' -print0)
+            done < <(find "$dir" -mindepth 1 -type f -name '*Test.php' \
+              ! -name 'Abstract*Test.php' ! -name '*AbstractTest.php' -print0)
           done
           
           ## run over EXCLUSION_LIST_FILES and call add_dir_to_line for each file