Connection: memoize connection owner's ID (#44282)

Prevent excessive database queries by memoizing connection owner ID throughout the request.

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/16295508775

Upstream-Ref: Automattic/jetpack@8546682

Author: sergeymitr

composer.json

@@ -6,7 +6,7 @@
 	"require": {
 		"php": ">=7.2",
 		"automattic/jetpack-assets": "^4.1.2",
-		"automattic/jetpack-connection": "^6.14.2",
+		"automattic/jetpack-connection": "^6.15.0-alpha",
 		"automattic/jetpack-constants": "^3.0.8",
 		"automattic/jetpack-status": "^5.4.0"
 	},