fix: Clarify FramesTracker log message

[philipphofmann]

📜 Description

Change two log messages to state they detected a slow or frozen frame but not to capture them.

💡 Motivation and Context

Came up here getsentry/sentry-cli#1902 (comment).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5993516) 89.255% compared to head (42db834) 89.202%.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #3570       +/-   ##
=============================================
- Coverage   89.255%   89.202%   -0.054%     
=============================================
  Files          529       529               
  Lines        57657     57707       +50     
  Branches     20630     20656       +26     
=============================================
+ Hits         51462     51476       +14     
- Misses        5287      5317       +30     
- Partials       908       914        +6     

Files	Coverage Δ
Sources/Sentry/SentryFramesTracker.m	100.000% <100.000%> (ø)

... and 19 files with indirect coverage changes

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1232.98 ms	1256.76 ms	23.78 ms
Size	21.58 KiB	417.88 KiB	396.30 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
e324230	1244.43 ms	1252.98 ms	8.55 ms
d760c3f	1200.95 ms	1233.96 ms	33.00 ms
5d6ce0e	1227.57 ms	1241.08 ms	13.51 ms
7cd187e	1223.41 ms	1249.40 ms	26.00 ms
407ff99	1216.63 ms	1235.50 ms	18.87 ms
dc0db9e	1246.06 ms	1260.46 ms	14.40 ms
881a955	1230.98 ms	1246.22 ms	15.24 ms
98cca71	1210.75 ms	1240.64 ms	29.89 ms
9faf217	1268.86 ms	1274.82 ms	5.96 ms
e1eed6b	1224.63 ms	1234.84 ms	10.20 ms

App size

Revision	Plain	With Sentry	Diff
e324230	22.85 KiB	408.88 KiB	386.03 KiB
d760c3f	22.84 KiB	403.17 KiB	380.33 KiB
5d6ce0e	22.85 KiB	405.38 KiB	382.53 KiB
7cd187e	20.76 KiB	401.66 KiB	380.89 KiB
407ff99	20.76 KiB	427.87 KiB	407.10 KiB
dc0db9e	20.76 KiB	419.62 KiB	398.86 KiB
881a955	22.85 KiB	407.63 KiB	384.79 KiB
98cca71	22.85 KiB	411.14 KiB	388.29 KiB
9faf217	20.76 KiB	419.70 KiB	398.94 KiB
e1eed6b	20.76 KiB	432.17 KiB	411.41 KiB

Previous results on branch: fix/frames-tracker-log-message

Startup times

Revision	Plain	With Sentry	Diff
c8f7b15	1205.31 ms	1222.59 ms	17.29 ms

App size

Revision	Plain	With Sentry	Diff
c8f7b15	21.58 KiB	417.90 KiB	396.32 KiB

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

- Clarify FramesTracker log message ([#3570](https://github.com/getsentry/sentry-cocoa/pull/3570))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description.

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