fix: Remove unnecessary delay before enabling chart interactions

[jperals]

Description

Setting isHandlersDisabled to true is only necessary at the moment where a popover is pinned. This is managed in the effect right below the change in this PR. It doesn't need to be set to true at first render. Doing so provokes a delay until the chart can be interacted with, which is non-perceivable to the end user but affects tests.

Related: https://github.com/cloudscape-design/components/discussions/2581

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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