Connection: register WP Abilities API reads (#48735)

* Connection abilities: register connection status reads via Registrar

* Connection abilities: single get-connection-status, jetpack-plugin-scoped loading

* Use enhancement changelog type for Jetpack plugin (changelogger validity)

* Regenerate plugin composer.lock files for connection package require-dev change

* Connection abilities: use jetpack category, drop plan_class, surface connection package version

Move the connection ability under the top-level `jetpack` category
(`jetpack/get-connection-status`) so future Jetpack abilities share one
namespace. Drop `plan_class` from the output — plan info isn't a
connection concern. Replace `jetpack_version` with `connection_version`
sourced from `Package_Version::PACKAGE_VERSION`, which is what actually
ships this ability.

* Connection abilities: gate get-connection-status on jetpack_admin_page cap

* Connection abilities: rename site_connected output field to site_registered

* Connection abilities: prefer WP 7.0 Connectors screen for registration URL

* Abilities: align shared jetpack category description across registrars

* Connection abilities: fix Connectors registration URL and detection

---------

Co-authored-by: Enej Bajgoric <enej.bajgoric@a8c.com>

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/26247343903

Upstream-Ref: Automattic/jetpack@167b080

Author: enejb

composer.json

@@ -8,7 +8,7 @@
 		"automattic/jetpack-blocks": "^3.3.3-alpha",
 		"automattic/jetpack-assets": "^4.3.38",
 		"automattic/jetpack-wp-build-polyfills": "^0.1.10-alpha",
-		"automattic/jetpack-connection": "^8.3.7",
+		"automattic/jetpack-connection": "^8.4.0-alpha",
 		"automattic/jetpack-device-detection": "^3.4.2",
 		"automattic/jetpack-external-connections": "^0.1.29-alpha",
 		"automattic/jetpack-jwt": "^0.2.4",
@@ -21,7 +21,7 @@
 	},
 	"require-dev": {
 		"yoast/phpunit-polyfills": "^4.0.0",
-		"automattic/jetpack-connection": "^8.3.7",
+		"automattic/jetpack-connection": "^8.4.0-alpha",
 		"automattic/jetpack-test-environment": "@dev",
 		"automattic/phpunit-select-config": "^1.0.6",
 		"automattic/wp-feature-api": "@dev"