STCOM-1091 Upgrade Downshift dependency.

[JohnC-80]

This PR updates our downshift dependency from v2 to v9. At it's completion it will involve a refactor of <Selection>, <MultiSelection>, and <AutoSuggest>.

• - Convert <Selection> to use <Downshift>.
  • - add capability for option groups.
• - Upgrade <MultiSelection> to use useMultiSelect hook from downshift.
• - Upgrade <AutoSuggest> to use useComboBox hook.

[github-actions]

Jest Unit Test Statistics

0 tests  ±0   0 ✔️ ±0   0s ⏱️ ±0s
0 suites ±0   0 💤 ±0 
0 files   ±0   0 ❌ ±0 

Results for commit 1f405ed. ± Comparison against base commit a04def6.

♻️ This comment has been updated with latest results.

[github-actions]

BigTest Unit Test Statistics

       1 files  ±0         1 suites  ±0   14s ⏱️ -1s
1 446 tests  - 4  1 440 ✔️  - 4  6 💤 ±0  0 ❌ ±0 
1 448 runs   - 4  1 442 ✔️  - 4  6 💤 ±0  0 ❌ ±0 

Results for commit 1f405ed. ± Comparison against base commit a04def6.

♻️ This comment has been updated with latest results.