[7.8] remove scroll in drag & drop context (#69710)

[XavierM]

Backports the following commits to 7.8:

• remove scroll in drag & drop context ([Security] Remove scroll onBeforeCapture #69710)

[andrew-goldstein]

Re-tested this branch locally against a cloud 7.8 GA release:

• At 4k monitor resolutions
• At default laptop (MBP) resolutions
• In Timeline, Timeline-based views, and non-Timeline based views in various scroll states / expanded-event states
• In the Network map (drag and drop from tooltips)
• With both fields and column headers
• With the Add to timeline investigation context menu (outside of Timeline, and within)
• Dragging to an un-populated timeline (with Timeline open)
• Dragging to a populated timeline (with Timeline open)
• Dragging to an un-populated timeline (with Timeline closed)
• Dragging to a populated timeline (with Timeline closed)
• With Chrome 83.0.4103.106
• With Firefox 77.01
• With Safari 13.1.1
  LGTM 🚀

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 1897539

Build metrics

page load asset size

beta

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total	-	-50.1MB	-

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