internal/lsp: test adding imports for package statements with comments
internal/lsp: test adding imports for package statements with comments

Test that having a comment at the start of a file allows imports
to be added correctly.

Updates golang/go#33721

Change-Id: Id1673c2509537413710b73261ad2a59afe06b93f
Reviewed-on: https://go-review.googlesource.com/c/tools/+/190800
Run-TryBot: Suzy Mueller <a1fd7fee333bfb1457f0c89ab258f70a76be3c5d@golang.org>
Reviewed-by: Ian Cottrell <52376736e5e84615ec49f9c1843b8acc178b1d8d@google.com>

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