Apply ctx abbreviation consistently

[huong-li-nguyen]

Description

• Small clean-up PR to use ctx instead of callback_context consistently to be less verbose and use official abbreviations, see here

Note: ctx shortcut currently doesn't exist for dash_clientside yet, so there we would use the old syntax. However, with this recent PR on Dash that got merged (but not released), we should be able to replace something like:

window.dash_clientside.callback_context.triggered[0].prop_id.split('.')[0] with
window.dash_clientside.callback_context.trigger_id in the future if we upgrade to the latest Dash version

Screenshot

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[maxschulz-COL]

lgtm

[petar-qb]

Looks good! 👍