Remove pagination from context (#807)

Pagination related flags now write directly to ListOption struct and enforce non negative numbers.
Flag tests were added to cover the validation

Reviewed-on: https://gitea.com/gitea/tea/pulls/807
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: TheFox0x7 <thefox0x7@gmail.com>
Co-committed-by: TheFox0x7 <thefox0x7@gmail.com>

cmd/milestones/issues.go

@@ -103,7 +103,7 @@ func runMilestoneIssueList(_ stdctx.Context, cmd *cli.Command) error {
 	}
 
 	issues, _, err := client.ListRepoIssues(ctx.Owner, ctx.Repo, gitea.ListIssueOption{
-		ListOptions: ctx.GetListOptions(),
+		ListOptions: flags.GetListOptions(),
 		Milestones:  []string{milestone},
 		Type:        kind,
 		State:       state,