gopls/internal/regtest/workspace: disable flaky MultiModule_OneBrokenModule test
gopls/internal/regtest/workspace: disable flaky MultiModule_OneBrokenModule test

This is flaking trybots in the main repo.

For golang/go#44227.

Change-Id: I5b67dedf39462a7c028d890b52142b7d2269d220
Reviewed-on: https://go-review.googlesource.com/c/tools/+/291231
Trust: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>
Run-TryBot: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>
gopls-CI: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>
Reviewed-by: Robert Findley <9179eee875d1ee628c37fb47d7e749e855ffd21f@google.com>

golang/tools,golang/tools,golang/tools,golang/tools,golang/tools