Add /model aliases for mode commands #700

Job	Run time
build-and-smoke-freebuff-windows	2m 23s
build-freebuff	1m 8s
e2e-version	54s
e2e-help-command	1m 20s
e2e-startup	1m 17s
e2e-code-edit	59s
e2e-agent-startup	2m 8s
e2e-ads-behavior	1m 16s
e2e-slash-commands	1m 11s
e2e-terminal-command	56s
	13m 32s

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