Plugin Extensions: Require meta-data to be defined in plugin.json during development mode (#93429)

* feat: add extensions to the backend plugin model

* feat: update the frontend plugin types

* feat(pluginContext): return a `null` if there is no context found

This will be necessary to understand if a certain hook is running inside a plugin context or not.

* feat: add utility functions for checking extension configs

* tests: fix failing tests due to the type updates

* feat(AddedComponentsRegistry): validate plugin meta-info

* feat(AddedLinksRegistry): validate  meta-info

* feat(ExposedComponentsRegistry): validate meta-info

* feat(usePluginComponent): add meta-info validation

* feat(usePluginComponents): add meta-info validation

* feat(usePluginLinks): add meta-info validation

* fix: only validate meta-info in registries if dev mode is enabled

* tests: add unit tests for the restrictions functionality

* tests: fix Go tests

* fix(tests): revert accidental changes

* fix: run goimports

* fix: api tests

* add nested app so that meta data can bested e2e tested

* refactor(types): extract the ExtensionInfo into a separate type

* refactor(extensions/utils): use Array.prototype.some() instead of .find()

* refactor(usePluginLinks): update warning message

* feat(usePluginExtensions()): validate plugin meta-info

* Wip

* fix(e2e): E2E tests for extensions

* fix(extensions): allow multiple "/" slashes in the extension point id

* fix(extensions/validators): stop validating the plugin id pattern

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Co-authored-by: Erik Sundell <erik.sundell87@gmail.com>

scripts/grafana-server/custom.ini

@@ -7,7 +7,7 @@ content_security_policy_template = """require-trusted-types-for 'script'; script
 enable = publicDashboards
 
 [plugins]
-allow_loading_unsigned_plugins=grafana-extensionstest-app,grafana-extensionexample1-app,grafana-extensionexample2-app,
+allow_loading_unsigned_plugins=grafana-extensionstest-app,grafana-extensionexample1-app,grafana-extensionexample2-app,grafana-extensionexample3-app
 
 [database]
 type=sqlite3