Move cache and variables to general.yml

ci/general.yml

+variables:
+  GIT_SUBMODULE_STRATEGY: recursive
+  PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
+  FF_NETWORK_PER_BUILD: "true"
+
+cache:
+  key:
+    files:
+      - poetry.lock
+      - pyproject.toml
+  paths:
+    - .cache/pip
+    - .tox