[9.0](backport #5693) Remove CODEOWNERS exception for dev-tools/integration/.env (#5696)

* Remove exception for dev-tools/integration/.env (#5693)

(cherry picked from commit e9366da)

# Conflicts:
#	.github/CODEOWNERS

* fix conflicts

---------

Co-authored-by: Eric Beahan <[email protected]>

Author: mergify[bot]

.github/CODEOWNERS

@@ -1,8 +1,6 @@
 # Team responsible for Fleet Server
 * @elastic/elastic-agent-control-plane
 
-# Allow to auto-merge PRs with Mergify
-dev-tools/integration/.env
 /.github/workflows @elastic/observablt-ci
 /.github/workflows/golangci-lint.yml @elastic/elastic-agent-control-plane
 /docs/release-notes @elastic/ingest-docs