fix(MultiSelect): clicking within the component focuses the autocomplete input

[juanca]

Motivation

QA observed that you can click around the icons and it would not "focus" the component. After clicking away, client-side validations were not running.

Acceptance Criteria

• On a required multi-select (or variants), you can click around the icons and click away
• Client-side validations show up as appropriate (e.g. required)

PR upkeep checklist

• [x] Change log entry
• [x] Deployment URL: https://mavenlink.github.io/design-system/fix-focus-on-multi-autocompleter/
• [ ] Green Bigmaven CI check
• [ ] DevQA on Bigmaven staging (e.g. does the work need to be imported in the internal design system?)