Connection: Remove auth providers support - revert #42602 (#43241)

* Connection: Remove auth providers support - revert #42602

* Remove unused constant in my-jetpack

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/14730608317

Upstream-Ref: Automattic/jetpack@8c8d8a6

Author: manzoorwanijk

composer.json

@@ -5,7 +5,7 @@
 	"license": "GPL-2.0-or-later",
 	"require": {
 		"php": ">=7.2",
-		"automattic/jetpack-connection": "^6.11.1",
+		"automattic/jetpack-connection": "^6.11.2-alpha",
 		"automattic/jetpack-assets": "^4.0.19",
 		"automattic/jetpack-constants": "^3.0.8",
 		"automattic/jetpack-status": "^5.1.4",