fix: remove internal macro SENTRY_UNWRAP_NULLABLE from public header

[philprime]

Moves the utility macro introduced in #5737 from the public SentryDefines.h to the internal SentryInternalDefines.h, as it does not need to be publicly exposed.

#skip-changelog

[philipphofmann]

LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.657%. Comparing base (b5ef4c0) to head (b764465).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #5759       +/-   ##
=============================================
+ Coverage   86.538%   86.657%   +0.119%     
=============================================
  Files          424       423        -1     
  Lines        36303     36327       +24     
  Branches     15457     17095     +1638     
=============================================
+ Hits         31416     31480       +64     
+ Misses        4844      4800       -44     
- Partials        43        47        +4     

Files with missing lines	Coverage Δ
Sources/Sentry/SentryArray.m	100.000% <ø> (ø)
Sources/Sentry/SentryNSDataUtils.m	97.619% <ø> (ø)
Sources/Sentry/SentyOptionsInternal.m	99.680% <ø> (ø)
Sources/Sentry/include/SentryInternalDefines.h	61.538% <100.000%> (+1.538%)	⬆️

... and 23 files with indirect coverage changes

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1231.88 ms	1257.54 ms	25.66 ms
Size	23.75 KiB	912.61 KiB	888.86 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
d3f650a	1225.45 ms	1241.86 ms	16.41 ms
e64d3d4	1241.90 ms	1260.10 ms	18.20 ms
0759f32	1237.10 ms	1257.35 ms	20.25 ms
aa96485	1215.37 ms	1234.04 ms	18.67 ms
2bddb03	1214.11 ms	1246.78 ms	32.67 ms
fc0757d	1231.83 ms	1248.98 ms	17.15 ms
99104c9	1224.84 ms	1247.08 ms	22.24 ms
f8029e2	1245.16 ms	1261.32 ms	16.16 ms
8ad303c	1220.02 ms	1231.79 ms	11.77 ms
079bcc8	1217.88 ms	1234.88 ms	17.00 ms

App size

Revision	Plain	With Sentry	Diff
d3f650a	23.75 KiB	902.48 KiB	878.73 KiB
e64d3d4	23.75 KiB	855.37 KiB	831.62 KiB
0759f32	23.75 KiB	880.20 KiB	856.46 KiB
aa96485	23.75 KiB	874.46 KiB	850.71 KiB
2bddb03	23.75 KiB	891.01 KiB	867.26 KiB
fc0757d	23.75 KiB	850.73 KiB	826.98 KiB
99104c9	23.75 KiB	894.83 KiB	871.09 KiB
f8029e2	23.75 KiB	893.72 KiB	869.97 KiB
8ad303c	23.75 KiB	879.24 KiB	855.49 KiB
079bcc8	23.74 KiB	874.07 KiB	850.33 KiB