Set mechanism type to suppressed for suppressed exceptions

[adinauer]

📜 Description

Set mechanism type to suppressed for suppressed exceptions so customers can distinguish exceptions causes from suppressed exceptions.

💡 Motivation and Context

Closes #4059

💚 How did you test it?

📝 Checklist

• 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.

🔮 Next steps

[github-actions]

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Generated by 🚫 dangerJS against 9092e40

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	437.31 ms	472.43 ms	35.12 ms
Size	1.65 MiB	2.31 MiB	678.23 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
00c8eeb	415.32 ms	428.08 ms	12.76 ms

App size

Revision	Plain	With Sentry	Diff
00c8eeb	1.70 MiB	2.36 MiB	671.98 KiB

Previous results on branch: feat/suppressed_exceptions_mechanism_type

Startup times

Revision	Plain	With Sentry	Diff
c33ea04	514.25 ms	545.59 ms	31.34 ms
34aecd9	379.29 ms	464.42 ms	85.13 ms

App size

Revision	Plain	With Sentry	Diff
c33ea04	1.65 MiB	2.31 MiB	678.22 KiB
34aecd9	1.65 MiB	2.31 MiB	678.22 KiB