CHARTS-148 - fix: use flex layout for ConversionFunnelChart to fill container height (#47119)

* fix: use flex layout for ConversionFunnelChart to fill container height

Switch from a fixed 200px height to a flex layout so the conversion
funnel chart can grow to fill its parent container.

* chore: remove packed charts tarball from repo

* fix: add height prop to ConversionFunnelChart for backward compatibility

Default height to 200px to maintain the original chart size when no
height is passed, while allowing consumers to override with values
like "100%" to fill their container.

* fix: add missing JSDoc @param for height prop

* fix: default ConversionFunnelChart to 100% height and use WordPress UI Stack

Replace custom flex layout with WordPress UI Stack component for layout
consistency. Default height changed from 200px to 100% so the chart
fills its parent container, matching other chart components in the
library. The height prop remains available for explicit fixed sizing.

* fix: resolve ConversionFunnelChart height with proper fallback chain

Use height prop > style.height > 100% default instead of always
defaulting the prop, which would override style.height.

* fix: add min-height fallback, height prop tests, and docs clarification

Set min-height: 200px on the chart content area to prevent collapse
when the parent container lacks an explicit height. Add unit tests
covering the height prop fallback chain and update docs to note the
parent container height requirement.

* fix: use data-testid in height tests instead of container.firstChild

Add data-testid to ConversionFunnelChart root element and refactor
height prop tests to use screen.getByTestId, removing eslint-disable
comments for testing-library/no-node-access.

* docs: fix indentation in ConversionFunnelChart height usage example

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/22173015845

Upstream-Ref: Automattic/jetpack@a7d4fbc

Author: Nikschavan