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

---------

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

server/public/model/config.go

@@ -109,8 +109,6 @@ const (
 	ServiceSettingsDefaultMaxLoginAttempts = 10
 	ServiceSettingsDefaultAllowCorsFrom    = ""
 	ServiceSettingsDefaultListenAndAddress = ":8065"
-	ServiceSettingsDefaultGfycatAPIKey     = "2_KtH_W5"
-	ServiceSettingsDefaultGfycatAPISecret  = "3wLVZPiswc3DnaiaFoLkDvB4X0IV6CpMkj4tf2inJRsBY6-FnkT08zGmppWFgeof"
 	ServiceSettingsDefaultGiphySdkKeyTest  = "s0glxvzVg9azvPipKxcPLpXV0q1x1fVP"
 	ServiceSettingsDefaultDeveloperFlags   = ""
 
@@ -347,8 +345,6 @@ type ServiceSettings struct {
 	WebsocketPort                                     *int    `access:"write_restrictable,cloud_restrictable"` // telemetry: none
 	WebserverMode                                     *string `access:"environment_web_server,write_restrictable,cloud_restrictable"`
 	EnableGifPicker                                   *bool   `access:"integrations_gif"`
-	GfycatAPIKey                                      *string `access:"integrations_gif"`
-	GfycatAPISecret                                   *string `access:"integrations_gif"`
 	GiphySdkKey                                       *string `access:"integrations_gif"`
 	EnableCustomEmoji                                 *bool   `access:"site_emoji"`
 	EnableEmojiPicker                                 *bool   `access:"site_emoji"`
@@ -736,14 +732,6 @@ func (s *ServiceSettings) SetDefaults(isUpdate bool) {
 		s.EnableGifPicker = NewBool(true)
 	}
 
-	if s.GfycatAPIKey == nil || *s.GfycatAPIKey == "" {
-		s.GfycatAPIKey = NewString(ServiceSettingsDefaultGfycatAPIKey)
-	}
-
-	if s.GfycatAPISecret == nil || *s.GfycatAPISecret == "" {
-		s.GfycatAPISecret = NewString(ServiceSettingsDefaultGfycatAPISecret)
-	}
-
 	if s.GiphySdkKey == nil || *s.GiphySdkKey == "" {
 		s.GiphySdkKey = NewString("")
 	}
@@ -4202,10 +4190,6 @@ func (o *Config) Sanitize() {
 		*o.MessageExportSettings.GlobalRelaySettings.SMTPPassword = FakeSetting
 	}
 
-	if o.ServiceSettings.GfycatAPISecret != nil && *o.ServiceSettings.GfycatAPISecret != "" {
-		*o.ServiceSettings.GfycatAPISecret = FakeSetting
-	}
-
 	if o.ServiceSettings.SplitKey != nil {
 		*o.ServiceSettings.SplitKey = FakeSetting
 	}