fix(core): Record byte discards for event processor drops

[adinauer]

📜 Description

Record byte-count client report outcomes when event processors drop log or trace metric events.

This adds LogByte and TraceMetricByte discarded-event entries alongside the existing LogItem and TraceMetric count entries for EventProcessor drops.

💡 Motivation and Context

Before this change, before-send and queue-overflow discard paths tracked both item count and byte count, but EventProcessor drops only tracked item count. This made byte-level client report accounting incomplete for logs and trace metrics.

💚 How did you test it?

• ./gradlew :sentry:test --tests "io.sentry.SentryClientTest"
• ./gradlew spotlessApply apiDump

📝 Checklist

• I added GH Issue ID & Linear ID
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.
• Public API changes reviewed by another Mobile SDK team member or implemented according to the develop docs spec.

🔮 Next steps

[sentry]

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.47.0 (1)	release

⚙️ sentry-android Build Distribution Settings

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	338.04 ms	400.31 ms	62.27 ms
Size	0 B	0 B	0 B

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
abfcc92	309.54 ms	380.32 ms	70.78 ms
4e3e79d	328.10 ms	395.64 ms	67.54 ms
8c1fb22	316.62 ms	352.78 ms	36.16 ms
b67bb28	307.59 ms	341.24 ms	33.65 ms
d15471f	361.89 ms	378.07 ms	16.18 ms
22f4345	313.52 ms	364.96 ms	51.44 ms
6727e14	337.22 ms	373.94 ms	36.71 ms
fc5ccaf	322.49 ms	405.25 ms	82.76 ms
22f4345	314.79 ms	375.02 ms	60.23 ms
2195398	319.02 ms	342.38 ms	23.36 ms

App size

Revision	Plain	With Sentry	Diff
abfcc92	1.58 MiB	2.13 MiB	557.31 KiB
4e3e79d	0 B	0 B	0 B
8c1fb22	0 B	0 B	0 B
b67bb28	0 B	0 B	0 B
d15471f	1.58 MiB	2.13 MiB	559.54 KiB
22f4345	1.58 MiB	2.29 MiB	719.83 KiB
6727e14	1.58 MiB	2.28 MiB	718.64 KiB
fc5ccaf	1.58 MiB	2.13 MiB	557.54 KiB
22f4345	1.58 MiB	2.29 MiB	719.83 KiB
2195398	0 B	0 B	0 B