Fix: Dont create transaction for unused ViewControllers

[brustolin]

📜 Description

Its possible to create a view controller but never add it to the view hierarchy.
This will create a transaction with data that is not helpful

💚 How did you test it?

Unit tests

📝 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 91.333%. Comparing base (149877e) to head (7780ec8).

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #4448       +/-   ##
=============================================
+ Coverage   91.318%   91.333%   +0.014%     
=============================================
  Files          609       610        +1     
  Lines        49855     49963      +108     
  Branches     17932     18037      +105     
=============================================
+ Hits         45527     45633      +106     
- Misses        4236      4238        +2     
  Partials        92        92               

Files with missing lines	Coverage Δ
Sources/Sentry/SentryTracer.m	97.202% <100.000%> (+0.290%)	⬆️
.../Sentry/SentryUIViewControllerPerformanceTracker.m	99.103% <100.000%> (+0.016%)	⬆️
...entryUIViewControllerPerformanceTrackerTests.swift	98.407% <100.000%> (+0.002%)	⬆️
...ts/SentryTests/Transaction/SentryTracerTests.swift	98.394% <100.000%> (+0.011%)	⬆️

... and 18 files with indirect coverage changes

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1228.55 ms	1245.65 ms	17.09 ms
Size	21.90 KiB	707.47 KiB	685.57 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
0ecf042	1228.25 ms	1250.67 ms	22.42 ms
0d32275	1230.96 ms	1237.90 ms	6.94 ms
e0f077c	1224.65 ms	1243.52 ms	18.87 ms
af1f4dd	1207.33 ms	1230.04 ms	22.71 ms
7bc3c0d	1212.35 ms	1228.94 ms	16.59 ms
3f366ee	1242.28 ms	1260.80 ms	18.52 ms
cb6ab62	1213.47 ms	1248.46 ms	34.99 ms
42ef6ba	1219.58 ms	1245.37 ms	25.78 ms
b9d59f7	1222.23 ms	1227.16 ms	4.93 ms
888a145	1228.63 ms	1248.94 ms	20.30 ms

App size

Revision	Plain	With Sentry	Diff
0ecf042	21.58 KiB	631.82 KiB	610.24 KiB
0d32275	22.84 KiB	403.14 KiB	380.29 KiB
e0f077c	22.85 KiB	412.59 KiB	389.74 KiB
af1f4dd	22.85 KiB	414.71 KiB	391.86 KiB
7bc3c0d	20.76 KiB	427.35 KiB	406.59 KiB
3f366ee	20.76 KiB	427.84 KiB	407.08 KiB
cb6ab62	22.85 KiB	413.42 KiB	390.57 KiB
42ef6ba	21.58 KiB	417.86 KiB	396.28 KiB
b9d59f7	22.85 KiB	405.77 KiB	382.92 KiB
888a145	21.58 KiB	713.54 KiB	691.96 KiB