chore: enable forcetypeassert linter, fix issues (#38804)

Enable [`forcetypeassert`](https://github.com/gostaticanalysis/forcetypeassert)
linter to prevent unchecked type assertions. ~650 issues fixed, most
fixes were clean, some use `setting.PanicInDevOrTesting`.

The only behaviour changes are where code would previously send a 500 error
or panic, a 4xx error is now emitted.

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/web/admin/admin.go

@@ -153,7 +153,7 @@ func SystemStatus(ctx *context.Context) {
 
 // DashboardPost run an admin operation
 func DashboardPost(ctx *context.Context) {
-	form := web.GetForm(ctx).(*forms.AdminDashboardForm)
+	form := web.GetForm[*forms.AdminDashboardForm](ctx)
 	ctx.Data["Title"] = ctx.Tr("admin.dashboard")
 	ctx.Data["PageIsAdminDashboard"] = true
 	updateSystemStatus()