Log a warning when dropping envelope items

[denrase]

📜 Description

Log a warning when dropping envelope items

💡 Motivation and Context

Closes #2436

💚 How did you test it?

Unit tests

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPii is enabled
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

[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

- Log a warning when dropping envelope items ([#3165](https://github.com/getsentry/sentry-dart/pull/3165))

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

Generated by 🚫 dangerJS against a391f6f

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.81%. Comparing base (e10be73) to head (a391f6f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3165      +/-   ##
==========================================
+ Coverage   87.79%   87.81%   +0.02%     
==========================================
  Files         291      291              
  Lines        9888     9891       +3     
==========================================
+ Hits         8681     8686       +5     
+ Misses       1207     1205       -2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[github-actions]

Android Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	446.62 ms	523.94 ms	77.32 ms
Size	6.54 MiB	7.71 MiB	1.17 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
e2d675d	457.92 ms	529.17 ms	71.25 ms
6f47800	451.04 ms	509.64 ms	58.60 ms
79f6b41	469.66 ms	525.90 ms	56.24 ms
0fb3800	465.64 ms	536.77 ms	71.13 ms
cc4e375	426.15 ms	482.34 ms	56.19 ms
f761369	462.73 ms	563.80 ms	101.06 ms
de377fd	572.35 ms	589.21 ms	16.87 ms
6b69699	456.06 ms	557.44 ms	101.38 ms
0fb45d0	482.79 ms	554.02 ms	71.23 ms
827bf09	475.40 ms	547.14 ms	71.74 ms

App size

Revision	Plain	With Sentry	Diff
e2d675d	6.54 MiB	7.69 MiB	1.15 MiB
6f47800	6.54 MiB	7.69 MiB	1.15 MiB
79f6b41	6.54 MiB	7.69 MiB	1.15 MiB
0fb3800	6.54 MiB	7.69 MiB	1.15 MiB
cc4e375	6.54 MiB	7.69 MiB	1.15 MiB
f761369	6.54 MiB	7.70 MiB	1.16 MiB
de377fd	6.54 MiB	7.71 MiB	1.17 MiB
6b69699	6.54 MiB	7.70 MiB	1.17 MiB
0fb45d0	6.54 MiB	7.70 MiB	1.17 MiB
827bf09	6.54 MiB	7.53 MiB	1015.27 KiB

[github-actions]

iOS Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1255.65 ms	1264.59 ms	8.95 ms
Size	20.71 MiB	22.43 MiB	1.73 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
2cb90b9	1272.90 ms	1285.55 ms	12.66 ms
dbd526b	1244.78 ms	1259.02 ms	14.24 ms
81f83eb	1259.53 ms	1273.39 ms	13.86 ms
793f4dc	1262.50 ms	1282.35 ms	19.85 ms
93b7728	1247.23 ms	1264.87 ms	17.64 ms
6ba4675	1223.12 ms	1238.17 ms	15.04 ms
4481076	1256.48 ms	1266.64 ms	10.17 ms
cc4e375	1253.06 ms	1263.81 ms	10.75 ms
73dca78	1246.65 ms	1265.42 ms	18.76 ms
ec78888	1251.37 ms	1269.40 ms	18.04 ms

App size

Revision	Plain	With Sentry	Diff
2cb90b9	7.86 MiB	9.54 MiB	1.69 MiB
dbd526b	7.86 MiB	9.44 MiB	1.58 MiB
81f83eb	7.86 MiB	9.44 MiB	1.58 MiB
793f4dc	7.86 MiB	9.44 MiB	1.58 MiB
93b7728	7.86 MiB	9.44 MiB	1.58 MiB
6ba4675	7.86 MiB	9.44 MiB	1.58 MiB
4481076	7.86 MiB	9.44 MiB	1.58 MiB
cc4e375	7.86 MiB	9.44 MiB	1.58 MiB
73dca78	7.86 MiB	9.44 MiB	1.58 MiB
ec78888	7.86 MiB	9.44 MiB	1.58 MiB

Previous results on branch: enha/debug-log-dropped-envelopes

Startup times

Revision	Plain	With Sentry	Diff
b289b5a	1252.00 ms	1268.04 ms	16.04 ms

App size

Revision	Plain	With Sentry	Diff
b289b5a	20.71 MiB	22.43 MiB	1.73 MiB