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Draft: feat(GlBaseDropdown): Use different positioning strategy to display horizontal content

What does this MR do?

Most of our dropdowns disclose vertically and may contain dynamically changing content (and height) so we prefer using a most space strategy, provided by autoPlacement, to avoid flipping content.

Some of our dropdowns may display content to the sides of the dropdown, and in these cases a flip strategy is better.

See more: !3540 (merged)

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Accessibility

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  • All actions and functionality can be done with a keyboard.
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  • Changes in a component’s state are announced by a screen reader. For example, changing aria-expanded="false" to aria-expanded="true" when an accordion is expanded.
  • Color combinations have sufficient contrast.

Closes #2615

Edited by Miguel Rincon

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