Remove old `data` property for column + stacked charts

What does this MR do?

This is a follow up MR in relation to #889 (closed) :

• !1703 (merged) added the bars and lines properties
• gitlab!46508 (merged) updated the charts in the gitlab project

This MR removes the data prop that is no longer needed.

Screenshots

No visual changes to the components

Does this MR meet the acceptance criteria?

Conformity

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• GitLab UI's contributing guidlines.
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• Added the ~"component:*" label(s) if applicable.

Security

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• Label as security and @ mention @gitlab-com/gl-security/appsec
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Closes #1020 (closed)