Add /model aliases for mode commands (#680) #701

Job	Run time
build-freebuff	1m 7s
build-and-smoke-freebuff-windows	2m 25s
e2e-version	53s
e2e-slash-commands	57s
e2e-help-command	1m 26s
e2e-terminal-command	51s
e2e-ads-behavior	1m 5s
e2e-startup	1m 9s
e2e-code-edit	51s
e2e-agent-startup	2m 16s
	13m 0s

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