x/tools/gopls: remove the experimentalWorkspaceModule setting

[findleyr]

A follow-up to #52897, this issue tracks removal of the "experimentalWorkspaceModule" gopls setting.

[gopherbot]

Change https://go.dev/cl/448116 mentions this issue: internal/regtest/workspace: permanently skip TestDeleteModule_Interdependent

[ma-hartma]

Hey there! Is there an alternative @findleyr? I really need this feature for working on monorepos and everything worked just fine over the last months of me using it.

[findleyr]

@ma-hartma yes, as the error message hopefully suggests, the alternative is to upgrade to Go 1.18 or later, and use a go.work file at the root of your workspace.
https://github.com/golang/tools/blob/master/gopls/doc/workspace.md#go-workspaces-go-118

More info on go.work files here:
https://go.dev/ref/mod#go-work-file

[gopherbot]

Change https://go.dev/cl/459635 mentions this issue: gopls/internal/lsp/cache: recreate Views when their root changes

[gopherbot]

Change https://go.dev/cl/459785 mentions this issue: gopls/internal/regtest: port experimental workspace tests to go.work