test: Add shared samples assets

[philipphofmann]

Remove duplicated AppIcon assets by using one shared samples assets.

#skip-changelog

[brustolin]

This is perfect. Thanks!!

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1213.67 ms	1239.08 ms	25.41 ms
Size	21.90 KiB	708.33 KiB	686.43 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
4350d44	1228.75 ms	1246.75 ms	18.00 ms
0559a8f	1239.78 ms	1252.60 ms	12.83 ms
4bca912	1252.42 ms	1260.06 ms	7.64 ms
bb7da60	1231.80 ms	1252.65 ms	20.85 ms
53a8885	1241.02 ms	1270.66 ms	29.64 ms
94d8eb3	1221.56 ms	1236.81 ms	15.26 ms
7e8d5fd	6249.23 ms	6253.90 ms	4.67 ms
b048ba3	1215.32 ms	1234.61 ms	19.29 ms
c9724f9	1199.38 ms	1229.54 ms	30.16 ms
b2e7962	1234.70 ms	1241.98 ms	7.28 ms

App size

Revision	Plain	With Sentry	Diff
4350d44	21.58 KiB	629.82 KiB	608.24 KiB
0559a8f	21.58 KiB	419.81 KiB	398.23 KiB
4bca912	22.85 KiB	411.14 KiB	388.29 KiB
bb7da60	21.58 KiB	697.84 KiB	676.25 KiB
53a8885	20.76 KiB	434.65 KiB	413.89 KiB
94d8eb3	21.58 KiB	417.86 KiB	396.28 KiB
7e8d5fd	20.76 KiB	435.50 KiB	414.74 KiB
b048ba3	21.90 KiB	707.64 KiB	685.74 KiB
c9724f9	20.76 KiB	427.66 KiB	406.90 KiB
b2e7962	21.58 KiB	670.39 KiB	648.81 KiB