chore: Avoid resolving SPM dependencies for Benchmarking app

[itaybre]

Because we now have some dependencies to sentry-cocoa SPM version on the workspace, Xcode will try to download sentry-cocoa on CI even when not needed.

Using the project instead of the workspace will let us skip that dependencies resolution.

#skip-changelog

Closes #6819

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.856%. Comparing base (25d9b58) to head (30023f1).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@              Coverage Diff              @@
##             main     #6818        +/-   ##
=============================================
+ Coverage   7.086%   84.856%   +77.769%     
=============================================
  Files         418       453        +35     
  Lines       26346     27609      +1263     
  Branches     9862     12102      +2240     
=============================================
+ Hits         1867     23428     +21561     
+ Misses      24466      3896     -20570     
- Partials       13       285       +272     

see 434 files with indirect coverage changes

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1224.20 ms	1251.09 ms	26.89 ms
Size	24.14 KiB	1.01 MiB	1014.90 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
ee1f2ca	1227.47 ms	1251.58 ms	24.12 ms
0759f32	1237.10 ms	1257.35 ms	20.25 ms
11853e6	1220.37 ms	1252.83 ms	32.46 ms
c6c1cb7	1235.71 ms	1263.80 ms	28.08 ms
7bd90de	1233.48 ms	1249.47 ms	15.99 ms
b9ceffb	1222.57 ms	1247.96 ms	25.39 ms
2fc1ea5	1236.23 ms	1246.79 ms	10.56 ms
837f5e4	1231.20 ms	1265.47 ms	34.27 ms
cd9727b	1236.04 ms	1254.41 ms	18.37 ms
debf3e9	1227.45 ms	1235.71 ms	8.26 ms

App size

Revision	Plain	With Sentry	Diff
ee1f2ca	24.15 KiB	1.01 MiB	1015.24 KiB
0759f32	23.75 KiB	880.20 KiB	856.46 KiB
11853e6	23.75 KiB	1.01 MiB	1016.04 KiB
c6c1cb7	23.75 KiB	928.15 KiB	904.40 KiB
7bd90de	23.75 KiB	933.33 KiB	909.58 KiB
b9ceffb	23.75 KiB	969.07 KiB	945.32 KiB
2fc1ea5	23.75 KiB	1.02 MiB	1016.53 KiB
837f5e4	23.75 KiB	1.01 MiB	1016.25 KiB
cd9727b	23.75 KiB	879.25 KiB	855.51 KiB
debf3e9	23.75 KiB	1.01 MiB	1006.46 KiB

Previous results on branch: itay/fix/benchmarking_workflow

Startup times

Revision	Plain	With Sentry	Diff
ff1deea	1207.38 ms	1245.59 ms	38.22 ms

App size

Revision	Plain	With Sentry	Diff
ff1deea	24.14 KiB	1.01 MiB	1014.90 KiB

[philipphofmann]

LGTM