GC-1373 Change TopNavDropdown to not require title prop

[kencrim]

GC-1373

Description

• Previous PR was causing console warnings because the new icon variants didn't have titles.

Reviewer Checklist

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Testing

• This code was tested by somebody other than the developer. Do not merge until this has been done.

[guardrails]

⚠️ We detected 11 security issues in this pull request:

Vulnerable Libraries (11)

Severity	Details
High	pkg:npm/@babel/[email protected] (t) upgrade to: > 7.18.6
Medium	pkg:npm/[email protected] (t) upgrade to: > 8.19.0
Medium	pkg:npm/[email protected] (t) upgrade to: > 8.7.1
Critical	pkg:npm/[email protected] (t) upgrade to: > 16.8.3
Critical	pkg:npm/@storybook/[email protected] (t) upgrade to: > 6.5.9
Medium	pkg:npm/[email protected] (t) upgrade to: > 7.11.0
Critical	pkg:npm/[email protected] (t) upgrade to: > 10.3.1
Informational	pkg:npm/[email protected] (t) upgrade to: > 3.1.6
Critical	pkg:npm/@storybook/[email protected] (t) upgrade to: > 6.5.9
Critical	pkg:npm/@storybook/[email protected] (t) upgrade to: > 6.5.9
Critical	pkg:npm/[email protected] (t) upgrade to: > 8.2.5

More info on how to fix Vulnerable Libraries in JavaScript.

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[shannamurry]

You should set a default of '' here