[Feature] Select Typeahead Enhancements

[grahamhency]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines
  Tests for the changes have been added
• Docs have been added or updated

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Style Update (CSS)
• Other... Please describe:

What is the current behavior?

• Drop down is always visible, regardless of if it has any items
• Drop down arrow is always visible, regardless of if it has any items
  Resolves [Feature] Hide typeToSearchText on Go-Select #635
  Resolves [Chore] Hide dropdown arrow on go-select #636

What is the new behavior?

• Drop down is hidden when the select is searchable and has no items
• Drop down arrow is hidden if the select is a typeahead and has items OR otherwise specified through the new hideDropDownArrow binding

Does this PR introduce a breaking change?

• Yes
• No

It shouldn't?