MM-54181 : Clean up code around deprecated Gfycat (#24343)

* first pass of removal

* first pass of removal

* Update admin_console.js

* rev beta

* remove more

* Update initial_state.ts

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Co-authored-by: Mattermost Build <build@mattermost.com>

server/config/client.go

@@ -79,8 +79,6 @@ func GenerateClientConfig(c *model.Config, telemetryID string, license *model.Li
 
 	props["EnableEmojiPicker"] = strconv.FormatBool(*c.ServiceSettings.EnableEmojiPicker)
 	props["EnableGifPicker"] = strconv.FormatBool(*c.ServiceSettings.EnableGifPicker)
-	props["GfycatApiKey"] = *c.ServiceSettings.GfycatAPIKey
-	props["GfycatApiSecret"] = *c.ServiceSettings.GfycatAPISecret
 	props["GiphySdkKey"] = getGiphySdkKey(c.ServiceSettings)
 	props["MaxFileSize"] = strconv.FormatInt(*c.FileSettings.MaxFileSize, 10)