internal/lsp/cache: keep going on failed analyzers
internal/lsp/cache: keep going on failed analyzers

A single failed analyzer should not prevent others from reporting their
diagnostics. This is especially relevant as we work on updating
analyzers to support generic code.

Change-Id: If1d958347649a99df92701fc4a4574cb7020596b
Reviewed-on: https://go-review.googlesource.com/c/tools/+/351550
Trust: Robert Findley <9179eee875d1ee628c37fb47d7e749e855ffd21f@google.com>
Run-TryBot: Robert Findley <9179eee875d1ee628c37fb47d7e749e855ffd21f@google.com>
gopls-CI: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Rebecca Stambler <d7cf11e5f299d88ea8348366a9fc4f7c335c3afa@golang.org>

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