fix: replayOnError capture on iOS

[vaind]

📜 Description

replay ID reported by the cocoa SDK is null when session replay is disabled and is only available once a replay has been captured after an error.

💡 Motivation and Context

Fixes the app crash during iOS app startup when session replay is disabled while onError replay is enabled.
Closes #2295

💚 How did you test it?

📝 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 90.93%. Comparing base (48c3cf1) to head (703db33).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2306      +/-   ##
==========================================
+ Coverage   88.03%   90.93%   +2.90%     
==========================================
  Files         247       73     -174     
  Lines        8585     2373    -6212     
==========================================
- Hits         7558     2158    -5400     
+ Misses       1027      215     -812     

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

Android Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	495.22 ms	548.82 ms	53.60 ms
Size	6.49 MiB	7.56 MiB	1.07 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
e8603bb	377.51 ms	444.77 ms	67.26 ms
754cdbe	325.08 ms	390.53 ms	65.45 ms
1d47eb7	282.26 ms	342.52 ms	60.26 ms
afa6e2a	349.73 ms	428.48 ms	78.75 ms
ef2f368	350.06 ms	429.44 ms	79.38 ms
48adddf	353.96 ms	431.10 ms	77.14 ms
77db8d4	493.88 ms	533.85 ms	39.98 ms
453e1bc	320.41 ms	372.73 ms	52.32 ms
a775d3f	359.58 ms	436.68 ms	77.10 ms
aed5947	295.70 ms	348.18 ms	52.48 ms

App size

Revision	Plain	With Sentry	Diff
e8603bb	6.34 MiB	7.28 MiB	967.80 KiB
754cdbe	6.16 MiB	7.14 MiB	1003.78 KiB
1d47eb7	6.16 MiB	7.14 MiB	1010.29 KiB
afa6e2a	6.27 MiB	7.20 MiB	955.69 KiB
ef2f368	5.94 MiB	6.89 MiB	975.81 KiB
48adddf	6.27 MiB	7.20 MiB	959.09 KiB
77db8d4	6.49 MiB	7.55 MiB	1.06 MiB
453e1bc	5.94 MiB	6.95 MiB	1.01 MiB
a775d3f	6.27 MiB	7.20 MiB	957.75 KiB
aed5947	5.94 MiB	6.96 MiB	1.02 MiB

[github-actions]

iOS Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1231.69 ms	1249.02 ms	17.33 ms
Size	8.38 MiB	9.74 MiB	1.36 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
cdf7172	1264.43 ms	1291.39 ms	26.96 ms
d0312c9	1205.55 ms	1224.45 ms	18.90 ms
deaeece	1252.82 ms	1279.04 ms	26.22 ms
84bc635	1252.26 ms	1273.96 ms	21.70 ms
b44db8f	1255.29 ms	1258.90 ms	3.61 ms
ecb4003	1266.94 ms	1290.24 ms	23.31 ms
88e4bfd	1236.44 ms	1256.33 ms	19.90 ms
cfa25fc	1251.77 ms	1275.69 ms	23.92 ms
abcdba3	1257.31 ms	1283.49 ms	26.18 ms
43760f9	1216.07 ms	1238.51 ms	22.44 ms

App size

Revision	Plain	With Sentry	Diff
cdf7172	8.16 MiB	9.16 MiB	1.01 MiB
d0312c9	8.32 MiB	9.39 MiB	1.06 MiB
deaeece	8.16 MiB	9.17 MiB	1.01 MiB
84bc635	8.33 MiB	9.40 MiB	1.07 MiB
b44db8f	8.29 MiB	9.37 MiB	1.08 MiB
ecb4003	8.09 MiB	9.07 MiB	1000.82 KiB
88e4bfd	8.33 MiB	9.64 MiB	1.31 MiB
cfa25fc	8.32 MiB	9.43 MiB	1.10 MiB
abcdba3	8.15 MiB	9.12 MiB	989.76 KiB
43760f9	8.29 MiB	9.36 MiB	1.07 MiB