MM-19606- Rework Prepackaged Plugins (#13449)

* MM-19609 - Add new prepackage configuration settings (#13062)

* Add signatures to the prepackaged plugins (#13138)

* MM-19612 - Support querying local plugin marketplace when upst… (#13250)

* MM-19612 - Support querying local plugin marketplace when upstream unavailable or disabled

* Update translations file

* Fixed comment

* Updated to check EnableRemoteMarketplace setting and LocalOnly to get marketplace plugins

* Fixed unit tests

* Tests cleanup code

* Removed unused error message

* Updated tests

* MM-19614- Updated Marketplace Service error id (#13388)

* [MM-19610] Consume prepackaged plugins (#13005)

* consume prepackaged plugins into memory

* missing i18n

* remove spurious .gitignore changes

* return on failure to install prepackged plugins

* cleanup

* s/plugins/availablePlugins

* whitespace

* don't return extractDir when not needed

* s/plug/plugin

* error on icon, cleanup

* update armored version of testplugin signature

* honour AutomaticPrepackagedPlugins

* document getPrepackagedPlugin

* MM-19613 - Include prepackaged plugins in marketplace results (#13433)

* Added prepackaged plugins to marketplace results

* PR Feedback

* PR Feedback

* Update error where definition

* Removing unnecessary var declaration

* Updated comments

* MM-21263 - Use EnableRemoteMarketplace in marketplace install… (#13438)

* MM-21263 - Use EnableRemoteMarketplace in marketplace install endpoint

* Call updateConfig before calling NewServer in TestHelper

* Added translations

* PR feedback

* Translations

* Feedback

* s/helpers.go/download.go

* Converging env.PrepackagedPlugins

* Initial PR feedback

* Ordered imports properly

* Updated DownloadURL to return slice of bytes

* Fixed method typo

* Fixed logging

* Added read lock for prepackaged plugins list

* PR Feedback

* Added condition to only install prepackaged plugin if it was previously enabled

* Linting

* Updated to check plugin state in config

* Closing filereader

* Only add local label if remote marketplace is enabled

* Updated local tag description

* Fixed tests

Co-authored-by: Ali Farooq <ali.farooq0@pm.me>
Co-authored-by: Shota Gvinepadze <wineson@gmail.com>
Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>
Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>

go.mod

@@ -26,6 +26,7 @@ require (
 	github.com/gorilla/schema v1.1.0
 	github.com/gorilla/websocket v1.4.1
 	github.com/gregjones/httpcache v0.0.0-20190611155906-901d90724c79 // indirect
+	github.com/h2non/go-is-svg v0.0.0-20160927212452-35e8c4b0612c
 	github.com/hako/durafmt v0.0.0-20190612201238-650ed9f29a84
 	github.com/hashicorp/go-hclog v0.9.2
 	github.com/hashicorp/go-immutable-radix v1.1.0 // indirect