ui: make go.work value visible

[hyangah]

[gopherbot]

Change https://go.dev/cl/386214 mentions this issue: src/goStatus: add go.work to status bar quickpick

[hyangah]

When clicking the Go status bar, go.work info will be shown in the quick pick menu like the following.
And users will be able to access the work file by selecting it.

We will continue improving UI and making the existence of go.work clearer (e.g. #2049). Closing for now.

Thanks @suzmue