prevent dropdowns from flowing off the screen

[macfarlandian]

Description of the change

Long dropdowns may compete with scroll-snapping behavior and make certain options difficult to access. This makes sure menus stay within the viewport and scroll their overflowing items if necessary.

Type of change

• Bug fix (non-breaking change that fixes an issue)

Related issues

Closes #463

Checklists

Development

These boxes should be checked by the submitter prior to merging:

• Manual testing against realistic data has been performed locally

Code review

These boxes should be checked by reviewers prior to merging:

• This pull request has a descriptive title and information useful to a reviewer
• This pull request has been moved out of a Draft state, has no "Work In Progress" label, and has assigned reviewers
• Potential security implications or infrastructural changes have been considered, if relevant

[coveralls]

Pull Request Test Coverage Report for Build 1076002835

• 6 of 7 (85.71%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.01%) to 84.934%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
spotlight-client/src/UiLibrary/Dropdown/InPlaceMenu.tsx	6	7	85.71%

Totals
Change from base Build 1054096480:	-0.01%
Covered Lines:	1943
Relevant Lines:	2165

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💛 - Coveralls