The new shared button offers a few extra features and an oportunity to make
multiple components more consistent. As such, the SubmitButton in the Calendly
block is being replaced.

The example is style: 'inline', which is the actual widget embed, where the Button is not displayed. So, defining the innerBlocks here is unnecessary. We can just define it within the edit.js where it is used instead.

Given the varying heights of the inline styled calendly blocks, its possible that the spinner is still visible after the widget loads. This will reposition it so it gets hidden.

Previously, on the frontend, clicking in the empty space beside the button would attempt to trigger the button's click.

Previous fix to event listener solved deperecated markup clicks but created issue on migrated and new blocks.

Only the URL has been added to passthrough attributes as other properties that may set via embed code can be updated via the button's block settings.

With the Gutenberg plugin v8.3.0 installed and active it creates slightly different markup so the preexisting styles no longer center align the button. This fixes that and improves frontend style.

Co-authored-by: Jeremy Herve <jeremy@jeremy.hu>

After switch to using the block button and passing through the url attribute, the embed params for background, text and primary color were lost. The original approach to parsing embed code strips the url back to basics and only adds the query string params when generating markup.

This change simply replaces the base url with the one containing query string params as this had the least impact on existing approach.

After the switch to the shared button block, the default color provided by the .wp-block wrapper element was lost this sets the same color.