fix(profiling): put back the missing insertion of initial frame rate

[armcknight]

In #3932, this line of code got accidentally removed. I'm not sure if this codepath is ever actually taken. It's not currently covered in tests; to be honest the mocking around GPU timestamps is a mess, and I haven't been able to untangle it to get this particular codepath covered. I hope to make more progress on that in #3985.

But I would like to get this merged before any release goes out, in case something would actually break.

#skip-changelog, for #3555

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 90.884%. Comparing base (d914696) to head (2127882).

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #3987       +/-   ##
=============================================
+ Coverage   90.802%   90.884%   +0.081%     
=============================================
  Files          594       594               
  Lines        46351     46351               
  Branches     16619     16617        -2     
=============================================
+ Hits         42088     42126       +38     
+ Misses        4083      4044       -39     
- Partials       180       181        +1     

Files	Coverage Δ
Sources/Sentry/SentryProfileTimeseries.mm	53.535% <0.000%> (-0.547%)	⬇️

... and 11 files with indirect coverage changes

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1220.96 ms	1235.23 ms	14.27 ms
Size	21.58 KiB	629.85 KiB	608.27 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
dd0557f	1242.04 ms	1250.86 ms	8.82 ms
742d4b6	1217.04 ms	1229.38 ms	12.33 ms
313b1d9	1240.18 ms	1258.44 ms	18.26 ms
533859f	1237.78 ms	1249.76 ms	11.98 ms
67460f4	1244.56 ms	1255.96 ms	11.40 ms
f0ce81c	1231.06 ms	1244.79 ms	13.73 ms
d3abae0	1200.36 ms	1224.22 ms	23.87 ms
56ec5d0	1236.65 ms	1261.90 ms	25.25 ms
e324230	1254.92 ms	1262.92 ms	8.00 ms
324dc7b	1210.33 ms	1244.92 ms	34.59 ms

App size

Revision	Plain	With Sentry	Diff
dd0557f	22.85 KiB	411.75 KiB	388.90 KiB
742d4b6	21.58 KiB	546.19 KiB	524.61 KiB
313b1d9	22.85 KiB	414.11 KiB	391.26 KiB
533859f	22.85 KiB	408.84 KiB	386.00 KiB
67460f4	20.76 KiB	426.15 KiB	405.39 KiB
f0ce81c	21.58 KiB	418.33 KiB	396.75 KiB
d3abae0	20.76 KiB	434.92 KiB	414.16 KiB
56ec5d0	20.76 KiB	414.44 KiB	393.69 KiB
e324230	22.85 KiB	408.88 KiB	386.03 KiB
324dc7b	22.85 KiB	408.84 KiB	385.99 KiB

[philipphofmann]

LGTM