CRS-442 emoji keyboard navigation

[ath92]

• Fixes regression around keyboard navigation in suggestions list (scroll position was no longer being updated on lists that don't fit the container)
• Fixes regression that caused the selected item to be reset to the first item (due to SuggestionListContainer being redefined in the render method of the Textarea component)
• Fixes CSS issue where ReactionList would sometimes cover the suggestions from TextAreaAutocomplete

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• I have signed the Stream CLA (required).
• The code changes follow best practices
• Code changes are tested (add some information if not applicable)

Description of the pull request

[github-actions]

Size Change: +16 B (0%)

Total Size: 1.53 MB

Filename	Size	Change
./dist/browser.full-bundle.js	730 kB	+6 B (0%)
./dist/browser.full-bundle.min.js	404 kB	-4 B (0%)
./dist/css/index.css	28.6 kB	+2 B (0%)
./dist/css/index.min.css	23.9 kB	+4 B (0%)
./dist/index.es.js	165 kB	+3 B (0%)
./dist/index.js	167 kB	+5 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
./dist/css/index.js	21 B	0 B
./dist/i18n/en.json	908 B	0 B
./dist/i18n/fr.json	1.39 kB	0 B
./dist/i18n/hi.json	1.57 kB	0 B
./dist/i18n/it.json	1.34 kB	0 B
./dist/i18n/nl.json	1.32 kB	0 B
./dist/i18n/ru.json	1.65 kB	0 B
./dist/i18n/tr.json	1.34 kB	0 B

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