Fix PR review comments on cookie banner branding

- Add scope parameter to UpdateShowBranding to prevent cross-tenant updates
- Use cmd.Context() instead of context.Background() in proboctl CLI
- Drop SQL column default after backfill in migration
- Add bounds check for int-to-int32 conversion in PG_POOL_SIZE
- Update branding link to getprobo.com homepage

Signed-off-by: Émile Ré <emile@getprobo.com>

pkg/cookiebanner/service.go

@@ -1587,7 +1587,7 @@ func (s *Service) SetShowBranding(
 		func(ctx context.Context, tx pg.Tx) error {
 			var banner coredata.CookieBanner
 			banner.ID = bannerID
-			if err := banner.UpdateShowBranding(ctx, tx, show); err != nil {
+			if err := banner.UpdateShowBranding(ctx, tx, coredata.NewNoScope(), show); err != nil {
 				if errors.Is(err, coredata.ErrResourceNotFound) {
 					return ErrBannerNotFound
 				}