x/tools/gopls: release version v0.23.0

[gopherbot]

This issue tracks progress toward releasing gopls@v0.23.0

• create or update gopls-release-branch.0.23
• update go.mod/go.sum (remove x/tools replace, update x/tools version)
• tag gopls/v0.23.0-pre.1
• update Github milestone
• write release notes
• smoke test features
• tag gopls/v0.23.0
• (if vX.Y.0 release): update dependencies in master for the next release

[gopherbot]

Change https://go.dev/cl/794480 mentions this issue: all: update codereview.cfg for gopls-release-branch.0.23

[gopherbot]

Change https://go.dev/cl/794540 mentions this issue: gopls: update go.mod for v0.23.0-pre.1

[gopherbot]

Change https://go.dev/cl/794482 mentions this issue: extension: update gopls v0.23.0-pre.1 settings

[gopherbot]

Change https://go.dev/cl/797620 mentions this issue: gopls: update go.mod for v0.23.0-pre.2

[gopherbot]

Change https://go.dev/cl/798800 mentions this issue: extension: update gopls v0.23.0 settings

[gopherbot]

Change https://go.dev/cl/798820 mentions this issue: gopls/go.mod: update dependencies following the v0.23.0 release