fix(expandable-panel): Fixed animation state issue when panel is insi…

[Sherif-Elhefnawy]

…de a container that gets removed from the DOM.

Updated behavior

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[Sherif-Elhefnawy]

Issue this fixes: https://github.com/dynatrace-oss/barista/issues/2515

[Sherif-Elhefnawy]

Cherry picked into: 10.7.x: f87e8a23e47fa2443545b4c251c20b96f64fd45c master: 6b3be7e58e993e496e2437ea87ff272956f0a9c7