Audit experimental features in ET/event-countdown-block

[WunderBart]

Master tracking issue: #44251
ET tracking issue: #46489

event-countdown-block is dependant on experimental features without a fallback for a scenario where such a feature is not supported anymore. Below is a list of usages that we need to update in this matter:

• wp-calypso/apps/editing-toolkit/editing-toolkit-plugin/event-countdown-block/blocks/src/edit.js

  Line 8 in 720b5da

  import { dateI18n, __experimentalGetSettings } from '@wordpress/date';

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