Introduce semver and static tests

.gitlab-ci.yml

+stages:
+    - static-tests
+
+# Static Tests
+semver-tests:
+    stage: static-tests
+    tags:
+        - php73
+    variables:
+        EXECUTOR_SUITE: module-semver
+        ALLOWED_CHANGE_LEVEL: 1
+    before_script:
+        - ~/.composer/vendor/met/test-executor/run.sh setup
+    script:
+        - ~/.composer/vendor/met/test-executor/run.sh tests
+    after_script:
+        - ~/.composer/vendor/met/test-executor/run.sh cleanup
+    only:
+        - merge_requests
+
+static-tests:
+    stage: static-tests
+    tags:
+        - php74
+        - mysql80
+        - es7
+    variables:
+        EXECUTOR_SUITE: module-static
+        MAGENTO_EDITION: community
+        MAGENTO_VERSION: 2.4.0
+    before_script:
+        - ~/.composer/vendor/met/test-executor/run.sh setup
+    script:
+        - ~/.composer/vendor/met/test-executor/run.sh tests
+    after_script:
+        - ~/.composer/vendor/met/test-executor/run.sh cleanup
+    only:
+        - merge_requests