The ornamental design for a packagingendcap, as shown and described.
FIG. 1 is a perspective view of a packaging end cap;
FIG. 2 is a left side view thereof, the right side view being a mirror image thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a top view thereof; and,
FIG. 6 is a bottom view thereof.
The claimed design extends only to the shaded portions of the packaging end cap. FIGS. 1-6 show portions of the packaging end cap in broken lines. The broken line portions are shown for environmental purposes and form no part of the claimed design. The broken line segments immediately adjacent the solid line portions of the design define the boundary of the design, but do not themselves form part of the claimed design.