[a11y] Fix dropdown aria-label and ID

[ipc103]

After upgrading to the WCAG 2.1 standard in our Cypress test, there was an issue raised with the dropdown component's aria-label. The 2.1 standard includes a rule that the text of an element should be contained within the aria-label https://dequeuniversity.com/rules/axe/3.5/label-content-name-mismatch?application=axeAPI The aria-label I was using on the component was too generic. I tested this using a screen reader and actually found that it worked well without the aria-label, because the role and haspopup attributes made it reasonably clear the intention. More user testing would be required to be sure, but for now I'd rather have less aria information than incorrect information.

In addition, I removed the id from the Dropdown. There are some places where we render multiple Dropdown components, which leads to the id not being unique.

[michaeljaltamirano]

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