message: Remove tag panel feature flag
  We forgot to remove this when taking tagpanel out of labs, so now
  this flag just does nothing.
diff: @@ -88,12 +88,6 @@ export const SETTINGS = {
  supportedLevels: LEVELS_FEATURE,
  default: false,
  },
  - "feature_tag_panel": {
  - isFeature: true,
  - displayName: _td("Tag Panel"),
  - supportedLevels: LEVELS_FEATURE,
  - default: false,
  - },
  "MessageComposerInput.dontSuggestEmoji": {
  supportedLevels: LEVELS_ACCOUNT_SETTINGS,
  displayName: _td('Disable Emoji suggestions while typing'),
  