feat: 🎸 auto position combined link actions dropdown

[DanweDE]

The new combined reference link action's dropdown will be positioned automatically, if necessary, above the trigger button (in most cases, if there's enough space, it will still be shown below). This should prevent the menu from being cut off when e.g. positioned at the end of a page.

[m10l]

@DanweDE I'd hold off on this - there's a PR open to refactor the dropdown component to use a more stable positioning package (popper.js) - contentful/forma-36#597

[DanweDE]

@m10l this PR shouldn't conflict with that work, but without it we wouldn't benefit from the positioning in contentful/forma-36#597 as auto-positioning is currently disabled on this button. Or am I missing something?

Seems like that PR is removing the isAutoalignmentEnabled altogether. If that'll really be the final version, we won't need this PR anymore (merging it now wouldn't harm though) but should clean-up the use of the prop.

[DanweDE]

Since the isAutoalignmentEnabled prop is celebrating its comeback in contentful/forma-36#597 I think we can just merge this PR @denkristoffer @m10l

I think I managed to replicate disabling positioning with the isAutoAlignmentEnabled prop. I have un-deprecated it, so we can get this in without breaking changes. I think it's ready.

[denkristoffer]

@DanweDE Looks right, but the values passed to the dropdown are also the default values, so are you sure this commit changes anything?

[DanweDE]

but the values passed to the dropdown are also the default values

@denkristoffer Pretty sure this is necessary, see this line where the default is false, not the actual dropdown default which would be true.

[suevalov]

@denkristoffer @DanweDE should it be closed by #466?

[denkristoffer]

@suevalov No it looks like the "Create entry" dropdown disables automatic positioning by default, so this is a good change.