x/tools/gopls: release version v0.14.1

[findleyr]

This issue tracks progress toward releasing gopls@v0.14.1

• cherry-pick changes into gopls-release-branch.0.14
• update go.mod/go.sum (remove x/tools replace, update x/tools version)
• tag gopls/v0.14.1-pre.1
• update Github milestone
• write release notes
• smoke test features
• tag gopls/v0.14.1

[gopherbot]

Change https://go.dev/cl/537880 mentions this issue: gopls: update go.mod for v0.14.1-pre.1