internal/lsp: remove tooltip from inlay hints
internal/lsp: remove tooltip from inlay hints

The tooltip for truncated inlay hint labels is redundant
with the hover state of the target identifier. This matches
the behavior of inlay hint implementations in other languages.

Change-Id: I209054f8c65df504cae67121e3cbc3eacaf02710
Reviewed-on: https://go-review.googlesource.com/c/tools/+/413417
Run-TryBot: Jamal Carvalho <e0195770807aa8c82b0b128d9c0423b5ad035172@golang.org>
Reviewed-by: Suzy Mueller <a1fd7fee333bfb1457f0c89ab258f70a76be3c5d@golang.org>
gopls-CI: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

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