x/tools/gopls: duplicate reload after workspace re-initialization

[findleyr]

Noticed this while debugging regression tests.

As a result of CL 417576, when we re-initialize a workspace we also do a follow-up load of all packages. Note that we must reload some packages for correctness (because they may have disappeared), but not all. We must prune our shouldLoad map during reinitialization.

[gopherbot]

Change https://go.dev/cl/424074 mentions this issue: internal/lsp/cache: clear shouldLoad IDs on load

[gopherbot]

Change https://go.dev/cl/428596 mentions this issue: [gopls-release-branch.0.9] internal/lsp/cache: clear shouldLoad IDs on load