chore: Convert SentryNetworkTrackingIntegration to Swift

[itaybre]

📜 Description

Converts SentryNetworkTrackingIntegration to Swift

💡 Motivation and Context

Objectives:

• Reduce ObjC
• Reliance on singletons

💚 How did you test it?

📝 Checklist

You have to check all boxes before merging:

• 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.
• I updated the wizard 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.

[linear]

COCOA-993 Refactor `SentryNetworkTrackingIntegration.m` in Swift

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.765%. Comparing base (406b0d4) to head (bdc5f85).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #7106       +/-   ##
=============================================
+ Coverage   84.714%   84.765%   +0.051%     
=============================================
  Files          459       459               
  Lines        27496     27510       +14     
  Branches     12121     12131       +10     
=============================================
+ Hits         23293     23319       +26     
+ Misses        4160      4149       -11     
+ Partials        43        42        -1     

Files with missing lines	Coverage Δ
Sources/Sentry/SentrySDKInternal.m	84.583% <100.000%> (-0.064%)	⬇️
Sources/Sentry/SentrySwizzleWrapperHelper.m	100.000% <100.000%> (ø)
Sources/Swift/Core/Integrations/Integrations.swift	100.000% <100.000%> (ø)
...nce/Network/SentryNetworkTrackingIntegration.swift	100.000% <100.000%> (ø)

... and 8 files with indirect coverage changes

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1224.53 ms	1243.49 ms	18.96 ms
Size	24.14 KiB	1.03 MiB	1.00 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
139db8b	1231.50 ms	1258.19 ms	26.69 ms
56f9cc6	1209.47 ms	1236.84 ms	27.37 ms
0529194	1237.23 ms	1254.67 ms	17.44 ms
3b059e5	1229.29 ms	1256.68 ms	27.40 ms
55f739c	1226.06 ms	1248.78 ms	22.71 ms
fae97e5	1229.20 ms	1256.27 ms	27.06 ms
7b3399c	1193.35 ms	1227.38 ms	34.03 ms
5ef2eed	1229.96 ms	1260.80 ms	30.84 ms
45482a6	1225.88 ms	1254.27 ms	28.39 ms
7a8b167	1223.12 ms	1251.61 ms	28.49 ms

App size

Revision	Plain	With Sentry	Diff
139db8b	23.75 KiB	920.64 KiB	896.89 KiB
56f9cc6	23.75 KiB	913.63 KiB	889.88 KiB
0529194	23.74 KiB	891.02 KiB	867.28 KiB
3b059e5	23.75 KiB	980.81 KiB	957.06 KiB
55f739c	23.75 KiB	858.73 KiB	834.98 KiB
fae97e5	23.75 KiB	912.37 KiB	888.62 KiB
7b3399c	23.75 KiB	946.68 KiB	922.94 KiB
5ef2eed	24.14 KiB	1023.18 KiB	999.04 KiB
45482a6	23.75 KiB	919.91 KiB	896.16 KiB
7a8b167	24.14 KiB	1.01 MiB	1013.98 KiB