internal/lsp/source: add a replacement for experimentalDisabledAnalyses
internal/lsp/source: add a replacement for experimentalDisabledAnalyses

Change-Id: I5bff1db1d937ffdcb8bb4e36f05073238fbdeb5f
Reviewed-on: https://go-review.googlesource.com/c/tools/+/226961
Run-TryBot: Rebecca Stambler <d7cf11e5f299d88ea8348366a9fc4f7c335c3afa@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Rohan Challa <9671c73253cee9b18b8df367e3e627fab2863fe8@golang.org>

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