Label dropdown should trigger under the label input within the "New epic" page

Summary

The label dropdown within the New epic page is triggered above the input even if no edge is detected. This dropdown should be triggering below the input unless there isn't enough space in the viewport per https://design.gitlab.com/components/dropdowns/#behavior

Current state	Desired state

Steps to reproduce

Open a new epic page in https://gitlab.com/groups/gitlab-org/-/epics/new and click on the labels input.

What is the current bug behavior?

What is the expected correct behavior?

Relevant logs and/or screenshots

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Output of checks

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Results of GitLab environment info

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`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

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sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes

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