[8.6](backport #2117) Added back agent team as codeowners (#2134)

* added back agent team as codeowners too (#2117)

(cherry picked from commit 211b19f)

# Conflicts:
#	.github/CODEOWNERS

* Update CODEOWNERS

Co-authored-by: Julia Bardi <90178898+juliaElastic@users.noreply.github.com>

Author: mergify[bot]

.github/CODEOWNERS

@@ -1,5 +1,5 @@
-# Team responsable for Fleet Server
-* @elastic/elastic-agent-control-plane
+# Team responsible for Fleet Server
+* @elastic/fleet @elastic/elastic-agent-control-plane
 
 # Allow to auto-merge PRs with Mergify
 dev-tools/integration/.env