fix: report energy usage in nanojoules

[armcknight]

Copypasta in #3217 led to reporting the wrong units for energy profiling metrics.

[codecov]

Codecov Report

Merging #3262 (106c741) into main (df2986b) will increase coverage by 0.062%.
The diff coverage is 100.000%.

@@              Coverage Diff              @@
##              main     #3262       +/-   ##
=============================================
+ Coverage   89.173%   89.235%   +0.062%     
=============================================
  Files          502       502               
  Lines        54209     54216        +7     
  Branches     19463     19467        +4     
=============================================
+ Hits         48340     48380       +40     
- Misses        4898      4982       +84     
+ Partials       971       854      -117     

Files Changed	Coverage
Sources/Sentry/SentryMetricProfiler.mm	100.000%
...SentryProfilerTests/SentryProfilerSwiftTests.swift	100.000%

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1233.65 ms	1257.88 ms	24.23 ms
Size	22.85 KiB	406.97 KiB	384.12 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
c319795	1205.12 ms	1231.20 ms	26.08 ms
d40512b	1231.12 ms	1244.54 ms	13.42 ms
69d8759	1229.88 ms	1240.45 ms	10.57 ms
879fb28	1243.18 ms	1255.98 ms	12.80 ms
7f14650	1249.73 ms	1269.88 ms	20.14 ms
c0b4b71	1246.98 ms	1256.77 ms	9.79 ms
869ab7e	1230.36 ms	1255.49 ms	25.13 ms
eed479f	1198.93 ms	1228.12 ms	29.19 ms
84fb4d9	1212.45 ms	1223.39 ms	10.94 ms
9e6665f	1237.58 ms	1253.84 ms	16.26 ms

App size

Revision	Plain	With Sentry	Diff
c319795	20.76 KiB	431.99 KiB	411.22 KiB
d40512b	20.76 KiB	427.77 KiB	407.00 KiB
69d8759	20.76 KiB	393.05 KiB	372.29 KiB
879fb28	22.84 KiB	402.88 KiB	380.03 KiB
7f14650	22.84 KiB	402.63 KiB	379.79 KiB
c0b4b71	20.76 KiB	430.98 KiB	410.22 KiB
869ab7e	20.76 KiB	432.88 KiB	412.11 KiB
eed479f	20.76 KiB	433.18 KiB	412.42 KiB
84fb4d9	22.84 KiB	402.56 KiB	379.72 KiB
9e6665f	22.84 KiB	403.52 KiB	380.67 KiB

Previous results on branch: armcknight/fix/energy-measurement-units

Startup times

Revision	Plain	With Sentry	Diff
8d9f9d2	1253.80 ms	1277.04 ms	23.24 ms

App size

Revision	Plain	With Sentry	Diff
8d9f9d2	22.85 KiB	406.94 KiB	384.09 KiB