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/repo/issue_timetrack.go

@@ -19,7 +19,7 @@ import (
 
 // AddTimeManually tracks time manually
 func AddTimeManually(c *context.Context) {
-	form := web.GetForm(c).(*forms.AddTimeManuallyForm)
+	form := web.GetForm[*forms.AddTimeManuallyForm](c)
 	issue := GetActionIssue(c)
 	if c.Written() {
 		return