Update dropdown.template.ts

[andrewcolombi]

add part="control" to the dropdown template control div to allow for css override of the rendered shadow-root component

Previous Behavior

fluent-dropdown rendered template has no part tag:

New Behavior

fluent-dropdown rendered template has part tag control:

Related Issue(s)

• Fixes #

[github-actions]

📊 Bundle size report

✅ No changes found

[github-actions]

Pull request demo site: URL

[github-actions]

🕵🏾‍♀️ visual changes to review in the Visual Change Report

vr-tests-web-components/Avatar 1 screenshots

Image Name	Diff(in Pixels)	Image Type
vr-tests-web-components/Avatar. - Dark Mode.normal.chromium.png	10380	Changed

vr-tests-web-components/Badge 1 screenshots

Image Name	Diff(in Pixels)	Image Type
vr-tests-web-components/Badge. - Dark Mode.normal.chromium.png	443	Changed

vr-tests-web-components/RadioGroup 1 screenshots

Image Name	Diff(in Pixels)	Image Type
vr-tests-web-components/RadioGroup. - Dark Mode.2nd selected.chromium_3.png	119	Changed

vr-tests-web-components/TextInput 1 screenshots

Image Name	Diff(in Pixels)	Image Type
vr-tests-web-components/TextInput. - Dark Mode.normal.chromium_1.png	288	Changed

There were 2 duplicate changes discarded. Check the build logs for more information.

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