fix(sdk): Collect only unique UIWindow references

[krystofwoldrich]

📜 Description

When scene and app delegate holds reference to the same windows, it's added twice to the array.

💡 Motivation and Context

Duplicate reference causes issues like taking two screenshots of the same window.

💚 How did you test it?

unit tests and rn sample app

📝 Checklist

You have to check all boxes before merging:

• I reviewed the submitted code.
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.399%. Comparing base (bce565d) to head (579b9d4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #4159       +/-   ##
=============================================
+ Coverage   91.381%   91.399%   +0.017%     
=============================================
  Files          605       606        +1     
  Lines        48570     48681      +111     
  Branches     17497     17565       +68     
=============================================
+ Hits         44384     44494      +110     
  Misses        4093      4093               
- Partials        93        94        +1     

Files	Coverage Δ
Sources/Sentry/SentryUIApplication.m	47.540% <100.000%> (ø)
Tests/SentryTests/SentryUIApplicationTests.swift	100.000% <100.000%> (ø)

... and 16 files with indirect coverage changes

---

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1231.45 ms	1253.38 ms	21.93 ms
Size	21.58 KiB	683.49 KiB	661.91 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
699d76f	1238.08 ms	1257.67 ms	19.59 ms
46267d8	1229.80 ms	1244.16 ms	14.37 ms
c0b4b71	1218.16 ms	1251.28 ms	33.12 ms
455619d	1231.40 ms	1237.70 ms	6.30 ms
103d817	1211.55 ms	1213.35 ms	1.80 ms
7bbb7c3	1232.40 ms	1249.78 ms	17.38 ms
1ac58a6	1232.07 ms	1254.69 ms	22.63 ms
e998fd0	1241.49 ms	1262.63 ms	21.14 ms
42ef6ba	1201.67 ms	1214.35 ms	12.67 ms
ef5821b	1253.18 ms	1265.46 ms	12.28 ms

App size

Revision	Plain	With Sentry	Diff
699d76f	21.58 KiB	631.82 KiB	610.24 KiB
46267d8	21.58 KiB	572.21 KiB	550.63 KiB
c0b4b71	20.76 KiB	430.98 KiB	410.22 KiB
455619d	20.76 KiB	432.87 KiB	412.11 KiB
103d817	21.58 KiB	571.91 KiB	550.33 KiB
7bbb7c3	21.58 KiB	418.78 KiB	397.20 KiB
1ac58a6	21.58 KiB	626.07 KiB	604.49 KiB
e998fd0	21.58 KiB	414.59 KiB	393.01 KiB
42ef6ba	21.58 KiB	417.86 KiB	396.28 KiB
ef5821b	21.58 KiB	414.96 KiB	393.37 KiB