Add disabled OpenCode Zen provider scaffold (#623) #578

Job	Run time
build-freebuff	1m 24s
build-and-smoke-freebuff-windows	3m 26s
e2e-ads-behavior	1m 9s
e2e-slash-commands	57s
e2e-help-command	1m 17s
e2e-startup	1m 1s
e2e-code-edit	52s
e2e-version	58s
e2e-agent-startup	2m 22s
e2e-terminal-command	57s
	14m 23s

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