chore(ci): Add timeout to UI tests

[itaybre]

Some tests have run for more than 2 hours: https://github.com/getsentry/sentry-cocoa/actions/runs/18385712036/job/52383740960

This will avoid the issue with a loose timeout

#skip-changelog

Closes #6392

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1235.46 ms	1264.16 ms	28.70 ms
Size	23.75 KiB	988.01 KiB	964.27 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
51b7dd3	1235.06 ms	1258.21 ms	23.15 ms
6cb4338	1238.47 ms	1256.96 ms	18.49 ms
397b9c9	1230.23 ms	1249.29 ms	19.06 ms
7273bf4	1202.42 ms	1227.62 ms	25.21 ms
9a32d52	1215.69 ms	1236.85 ms	21.16 ms
d06a4db	1233.20 ms	1243.18 ms	9.98 ms
6e99155	1223.96 ms	1249.25 ms	25.29 ms
4267263	1233.13 ms	1266.13 ms	33.00 ms
d637379	1226.43 ms	1250.77 ms	24.34 ms
ed85746	1231.79 ms	1248.55 ms	16.75 ms

App size

Revision	Plain	With Sentry	Diff
51b7dd3	23.75 KiB	913.26 KiB	889.52 KiB
6cb4338	23.75 KiB	913.63 KiB	889.88 KiB
397b9c9	23.75 KiB	959.44 KiB	935.70 KiB
7273bf4	23.75 KiB	908.01 KiB	884.26 KiB
9a32d52	23.75 KiB	981.29 KiB	957.54 KiB
d06a4db	23.75 KiB	913.18 KiB	889.43 KiB
6e99155	23.75 KiB	963.18 KiB	939.43 KiB
4267263	23.75 KiB	988.03 KiB	964.28 KiB
d637379	23.75 KiB	855.38 KiB	831.63 KiB
ed85746	23.75 KiB	920.83 KiB	897.08 KiB

[philipphofmann]

LGTM