[MM-44056] Make Calls plugin's state on Cloud controllable by feature flag (#20161)

* Make Calls plugin's state on Cloud controllable by feature flag

* Prepackage Calls v0.4.9 (#20148)

* Update app/plugin.go

Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>

* Update app/plugin_install.go

Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>

* Bump Calls version to latest

Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

Makefile

@@ -119,6 +119,7 @@ TEMPLATES_DIR=templates
 PLUGIN_PACKAGES ?= mattermost-plugin-antivirus-v0.1.2
 PLUGIN_PACKAGES += mattermost-plugin-autolink-v1.2.2
 PLUGIN_PACKAGES += mattermost-plugin-aws-SNS-v1.2.0
+PLUGIN_PACKAGES += mattermost-plugin-calls-v0.5.1
 PLUGIN_PACKAGES += mattermost-plugin-channel-export-v1.0.0
 PLUGIN_PACKAGES += mattermost-plugin-custom-attributes-v1.3.0
 PLUGIN_PACKAGES += mattermost-plugin-github-v2.0.1