plugin: update resolveSystemPlugins default

The commit updates the `resolveSystemPlugins` backend application prop
to `false` since it has the better behavior. The flag was initially set
to `true` not to have breaking behavior changes as part of `v1.19.0`.

The prop is used to not resolve system extension-packs and dependencies
at runtime, and instead resolve them at buildtime.

Signed-off-by: vince-fugnitto <[email protected]>

doc/Migration.md

@@ -13,9 +13,9 @@ Please see the latest version (`master`) for the most up-to-date information. Pl
 
 Introduced in `v1.19.0` was the feature to better support extension-packs which both contribute functionality and reference plugins (by `id`).
 The feature works best when there is no runtime plugin resolvement for system (builtin) plugins as it should be done at build time instead.
-In order not to change behavior today, the feature is behind an application prop (acting as a flag). If you want to enable better support for
-extension-packs and extension-dependencies as builtins the property should be turned off. You can disable the resolvement in your application's 
-`package.json` like so:
+The feature is behind an application property, acting as a flag to enable/disable the feature. If you want to enable better support for
+extension-packs and extension-dependencies as builtins the property should be turned off (default). You can enable/disable the resolution of system
+plugin dependencies in your application's `package.json` like so:
 
 
 ```json

packages/plugin-ext/src/hosted/node/hosted-plugin-deployer-handler.ts

@@ -86,7 +86,7 @@ export class HostedPluginDeployerHandler implements PluginDeployerHandler {
             const metadata = this.reader.readMetadata(manifest);
             const dependencies: PluginDependencies = { metadata };
             // Do not resolve system (aka builtin) plugins because it should be done statically at build time.
-            const { resolveSystemPlugins = true } = BackendApplicationConfigProvider.get();
+            const { resolveSystemPlugins = false } = BackendApplicationConfigProvider.get();
             if (resolveSystemPlugins || entry.type !== PluginType.System) {
                 dependencies.mapping = this.reader.readDependencies(manifest);
             }