x/tools/gopls: release version v0.22.0

[gopherbot]

This issue tracks progress toward releasing gopls@v0.22.0

• create or update gopls-release-branch.0.22
• update go.mod/go.sum (remove x/tools replace, update x/tools version)
• tag gopls/v0.22.0-pre.1
• update Github milestone
• write release notes
• smoke test features
• tag gopls/v0.22.0
• (if vX.Y.0 release): update dependencies in master for the next release

[gopherbot]

Change https://go.dev/cl/771680 mentions this issue: all: update codereview.cfg for gopls-release-branch.0.22

[gopherbot]

Change https://go.dev/cl/771940 mentions this issue: gopls: update go.mod for v0.22.0-pre.1

[gopherbot]

Change https://go.dev/cl/767980 mentions this issue: gopls/doc/release/v0.22.0.md: update release notes

[gopherbot]

Change https://go.dev/cl/774701 mentions this issue: [gopls-release-branch.0.22] gopls/doc/release/v0.22.0.md: update release notes

[gopherbot]

Change https://go.dev/cl/775840 mentions this issue: extension: update gopls v0.22.0-pre.1 settings

[gopherbot]

Change https://go.dev/cl/775881 mentions this issue: gopls: update go.mod for v0.22.0-pre.2