ci/drone/tests/e2e: do not run E2E_EXTRA tests in Drone as it takes forever, blocking other pipelines

.drone.yml

@@ -32,7 +32,7 @@ steps:
     commands:
       - apk add git bash curl sudo jq make
       - sleep 5  # give docker enough time to start
-      - make e2e -e E2E_EXTRA=true # E2E_EXTRA=true enables tests with multiple k3s versions
+      - make e2e
     when:
       event:
         - push

CHANGELOG.md

@@ -42,7 +42,6 @@
 - tests/e2e: add config override test
 - tests/e2e: add multi server start-stop cycle test
 - tests/e2e: improved logs with stage and test details.
-- ci/drone+tests/e2e: use E2E_EXTRA=true to always test multiple k3s versions in CI
 - builds&tests: use Docker 20.10 and BuildKit everywhere
 - :memo: docs: add <https://github.com/AbsaOSS/k3d-action> (GitHub Action) as a related project (#476, @kuritka)