[AVT] Accessible name must match or contain the visible label text

[yanweibj]

Environment

Operating system
MacOS
Browser
Chrome
Automated testing tool and ruleset
DAP
IBM Accessibility January 2020
IBM Accessibility Experimental

Detailed description

What version of the Carbon Design System are you using?
Carbon v10
What did you expect to happen?
Accessible name should contain the visible text label
What happened instead?
Accessible name does not contain the visible text label
https://aat.w3ibm.mybluemix.net/token/dd9b1ac8-55f6-4f23-a8fa-9b4851c53e38/fafaad8a-304a-497f-bcaa-f64496bff7bf/archives/2019NovDeploy//doc/w3/help/en-US/idhi_accessibility_check_g1202.html
What WCAG 2.1 checkpoint does the issue violate?
2.5.3 Label in Name

Steps to reproduce the issue

1. Render a Dropdown component
2. In inspect check that accessible name does not contain the visible text label

[yanweibj]

[yanweibj]

[asudoh]

Seems a duplicate of #4531, which is addressed by #4820.