MM-28892 Disabling server config settings for inproduct notices in e2e (

mattermost#6512)

* MM-28892 Disabling server config settings for inproduct notices in e2e

  * Disabling these settings so no notices are served which can cause existing tests to
    break as UI will have modal open

* Change default json

e2e/cypress/fixtures/partial_default_config.json

@@ -263,7 +263,9 @@
  "BannerText": "",
  "BannerColor": "#f2a93b",
  "BannerTextColor": "#333333",
- "AllowBannerDismissal": true
+ "AllowBannerDismissal": true,
+ "AdminNoticesEnabled": false,
+ "UserNoticesEnabled": false
  },
  "ThemeSettings": {
  "EnableThemeSelection": true,