feat(ChatbotHeaderNewChatButton): add new chat button (#626) #310

Job	Run time
call-build-lint-test-workflow / build	1m 42s
call-build-lint-test-workflow / test_a11y	2m 47s
call-build-lint-test-workflow / test_jest	2m 34s
call-build-lint-test-workflow / lint	1m 25s
deploy	52s
	9m 20s

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