fix: Session replay in buffer mode not working

[brustolin]

The frames during buffer mode were not being saved to disk.

#skip-changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.308%. Comparing base (e773cad) to head (9e039ba).

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #4160       +/-   ##
=============================================
- Coverage   91.356%   91.308%   -0.048%     
=============================================
  Files          606       605        -1     
  Lines        48346     48255       -91     
  Branches     17447     17374       -73     
=============================================
- Hits         44167     44061      -106     
- Misses        4086      4100       +14     
- Partials        93        94        +1     

Files	Coverage Δ
...tegrations/SessionReplay/SentrySessionReplay.swift	91.304% <100.000%> (ø)
...tions/SessionReplay/SentrySessionReplayTests.swift	97.633% <100.000%> (+0.117%)	⬆️

... and 21 files with indirect coverage changes

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1223.63 ms	1234.06 ms	10.44 ms
Size	21.58 KiB	681.82 KiB	660.24 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
60d6cec	1257.14 ms	1273.92 ms	16.78 ms
f0283e8	1253.36 ms	1263.12 ms	9.76 ms
ff09c7e	1240.94 ms	1262.66 ms	21.72 ms
ae9c51b	1244.85 ms	1264.33 ms	19.47 ms
f5623cd	1255.78 ms	1262.30 ms	6.52 ms
8aec30e	1235.73 ms	1255.87 ms	20.14 ms
c0ff306	1218.92 ms	1240.64 ms	21.72 ms
afd1a08	1207.78 ms	1223.44 ms	15.66 ms
9fa25c2	1211.88 ms	1228.36 ms	16.48 ms
2b19b82	1237.45 ms	1256.60 ms	19.16 ms

App size

Revision	Plain	With Sentry	Diff
60d6cec	22.84 KiB	403.51 KiB	380.67 KiB
f0283e8	20.76 KiB	393.36 KiB	372.60 KiB
ff09c7e	20.76 KiB	427.76 KiB	407.00 KiB
ae9c51b	22.85 KiB	411.13 KiB	388.28 KiB
f5623cd	22.85 KiB	412.98 KiB	390.13 KiB
8aec30e	21.58 KiB	616.75 KiB	595.17 KiB
c0ff306	20.76 KiB	434.65 KiB	413.89 KiB
afd1a08	22.84 KiB	402.57 KiB	379.72 KiB
9fa25c2	22.85 KiB	407.44 KiB	384.59 KiB
2b19b82	21.58 KiB	542.19 KiB	520.61 KiB