fix(app-start): accessing null json fields from fetchNativeAppStart

[buenaflor]

📜 Description

Fixes issue from crash detection where one of the json fields can be null

💚 How did you test it?

Unit test

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPii is enabled
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.02%. Comparing base (824c070) to head (ab6e938).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2340      +/-   ##
==========================================
+ Coverage   78.16%   84.02%   +5.85%     
==========================================
  Files          22       75      +53     
  Lines         907     2616    +1709     
==========================================
+ Hits          709     2198    +1489     
- Misses        198      418     +220     

☔ View full report in Codecov by Sentry.
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[github-actions]

Android Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	501.04 ms	586.69 ms	85.65 ms
Size	6.49 MiB	7.56 MiB	1.07 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
8ced2dc	295.58 ms	336.49 ms	40.91 ms
559d28f	302.35 ms	339.53 ms	37.18 ms
62ae1b3	419.60 ms	494.14 ms	74.54 ms
6d7a391	331.94 ms	367.04 ms	35.10 ms
3ad66e4	406.90 ms	481.48 ms	74.58 ms
3334ac1	303.98 ms	366.65 ms	62.67 ms
0118295	365.71 ms	438.56 ms	72.85 ms
7e7f0b1	387.44 ms	459.14 ms	71.70 ms
fe4aa56	356.06 ms	428.67 ms	72.61 ms
25161f4	353.98 ms	431.94 ms	77.96 ms

App size

Revision	Plain	With Sentry	Diff
8ced2dc	6.06 MiB	7.03 MiB	990.29 KiB
559d28f	5.94 MiB	6.92 MiB	1001.70 KiB
62ae1b3	6.35 MiB	7.40 MiB	1.05 MiB
6d7a391	5.94 MiB	6.95 MiB	1.01 MiB
3ad66e4	6.33 MiB	7.26 MiB	947.04 KiB
3334ac1	6.06 MiB	7.03 MiB	993.54 KiB
0118295	6.33 MiB	7.26 MiB	947.07 KiB
7e7f0b1	6.35 MiB	7.34 MiB	1008.33 KiB
fe4aa56	6.06 MiB	7.10 MiB	1.04 MiB
25161f4	6.27 MiB	7.20 MiB	960.44 KiB

[github-actions]

iOS Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1242.08 ms	1273.98 ms	31.89 ms
Size	8.38 MiB	9.74 MiB	1.36 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
24b6e60	1250.69 ms	1268.63 ms	17.94 ms
2e1e4ae	1254.41 ms	1278.55 ms	24.14 ms
6a5a65d	1237.22 ms	1250.29 ms	13.07 ms
73d70bf	1249.08 ms	1268.41 ms	19.33 ms
7faee57	1232.65 ms	1246.10 ms	13.45 ms
43760f9	1216.07 ms	1238.51 ms	22.44 ms
6daa837	1250.42 ms	1265.60 ms	15.18 ms
d4120ac	1260.61 ms	1274.09 ms	13.47 ms
d883d62	1221.39 ms	1230.18 ms	8.80 ms
43abc4f	1248.33 ms	1272.86 ms	24.52 ms

App size

Revision	Plain	With Sentry	Diff
24b6e60	8.32 MiB	9.38 MiB	1.06 MiB
2e1e4ae	8.34 MiB	9.65 MiB	1.31 MiB
6a5a65d	8.34 MiB	9.65 MiB	1.31 MiB
73d70bf	8.38 MiB	9.70 MiB	1.33 MiB
7faee57	8.33 MiB	9.64 MiB	1.31 MiB
43760f9	8.29 MiB	9.36 MiB	1.07 MiB
6daa837	8.33 MiB	9.40 MiB	1.07 MiB
d4120ac	8.28 MiB	9.34 MiB	1.06 MiB
d883d62	8.29 MiB	9.36 MiB	1.07 MiB
43abc4f	8.33 MiB	9.54 MiB	1.21 MiB

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

- accessing null json fields from `fetchNativeAppStart` ([#2340](https://github.com/getsentry/sentry-dart/pull/2340))

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