Fix: Add unhandled rejection mechanism

[lucas-zimerman]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

Unhandled rejection were lacking the Mechanism field, so I added it.

💡 Motivation and Context

#4093

💚 How did you test it?

Unit test and https://sentry-sdks.sentry.io/issues/6018946733/events/91e85dfdbd5340c487e7d279378441d4/?project=5428561

📝 Checklist

• 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.
• I updated the wizard if needed.
• All tests passing
• No breaking changes

🔮 Next steps

[github-actions]

iOS (legacy) Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1241.52 ms	1234.18 ms	-7.34 ms
Size	2.63 MiB	3.69 MiB	1.05 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
c2a4e9b+dirty	1240.10 ms	1239.22 ms	-0.88 ms
80b2ce3+dirty	1265.92 ms	1268.60 ms	2.69 ms
db44eaf+dirty	1227.09 ms	1230.65 ms	3.56 ms
e2b64fe+dirty	1232.22 ms	1255.20 ms	22.98 ms
8ab11b6+dirty	1203.23 ms	1206.02 ms	2.79 ms
2534337+dirty	1225.08 ms	1230.26 ms	5.17 ms
83f6f6c+dirty	1218.33 ms	1220.27 ms	1.93 ms
4a6664f+dirty	1209.49 ms	1208.63 ms	-0.86 ms
3aecc61+dirty	1237.75 ms	1237.42 ms	-0.33 ms
52c0562+dirty	1219.34 ms	1221.25 ms	1.91 ms

App size

Revision	Plain	With Sentry	Diff
c2a4e9b+dirty	2.36 MiB	3.08 MiB	734.00 KiB
80b2ce3+dirty	2.36 MiB	2.84 MiB	486.98 KiB
db44eaf+dirty	2.36 MiB	3.10 MiB	755.81 KiB
e2b64fe+dirty	2.36 MiB	2.85 MiB	495.80 KiB
8ab11b6+dirty	2.36 MiB	3.11 MiB	759.83 KiB
2534337+dirty	2.36 MiB	2.88 MiB	525.47 KiB
83f6f6c+dirty	2.36 MiB	3.10 MiB	759.79 KiB
4a6664f+dirty	2.36 MiB	3.04 MiB	696.39 KiB
3aecc61+dirty	2.36 MiB	3.12 MiB	778.58 KiB
52c0562+dirty	2.36 MiB	3.14 MiB	793.36 KiB

[github-actions]

iOS (new) Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1226.84 ms	1213.61 ms	-13.23 ms
Size	3.19 MiB	4.25 MiB	1.06 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
c2a4e9b+dirty	1247.39 ms	1243.04 ms	-4.35 ms
80b2ce3+dirty	1245.12 ms	1262.04 ms	16.92 ms
db44eaf+dirty	1238.49 ms	1236.56 ms	-1.93 ms
e2b64fe+dirty	1285.78 ms	1297.56 ms	11.78 ms
8ab11b6+dirty	1222.91 ms	1216.08 ms	-6.83 ms
2534337+dirty	1220.87 ms	1221.47 ms	0.60 ms
83f6f6c+dirty	1232.02 ms	1229.15 ms	-2.87 ms
4a6664f+dirty	1218.77 ms	1221.07 ms	2.30 ms
3aecc61+dirty	1240.27 ms	1240.51 ms	0.24 ms
52c0562+dirty	1233.94 ms	1226.29 ms	-7.65 ms

App size

Revision	Plain	With Sentry	Diff
c2a4e9b+dirty	2.92 MiB	3.64 MiB	739.91 KiB
80b2ce3+dirty	2.92 MiB	3.40 MiB	492.75 KiB
db44eaf+dirty	2.92 MiB	3.66 MiB	761.15 KiB
e2b64fe+dirty	2.92 MiB	3.41 MiB	499.97 KiB
8ab11b6+dirty	2.92 MiB	3.67 MiB	772.38 KiB
2534337+dirty	2.92 MiB	3.43 MiB	529.76 KiB
83f6f6c+dirty	2.92 MiB	3.67 MiB	772.37 KiB
4a6664f+dirty	2.92 MiB	3.60 MiB	702.09 KiB
3aecc61+dirty	2.92 MiB	3.69 MiB	789.88 KiB
52c0562+dirty	2.92 MiB	3.69 MiB	794.15 KiB

[github-actions]

Android (legacy) Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	352.22 ms	343.33 ms	-8.89 ms
Size	17.75 MiB	20.11 MiB	2.37 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
83f6f6c	418.83 ms	410.94 ms	-7.89 ms
8c88ac7	411.15 ms	400.54 ms	-10.60 ms
baa882f	354.93 ms	356.18 ms	1.25 ms
12427f4	393.69 ms	414.84 ms	21.14 ms
c830127	407.57 ms	409.50 ms	1.93 ms
5571a20	410.55 ms	441.06 ms	30.51 ms
700cbf4	425.56 ms	436.26 ms	10.70 ms
690220d	468.28 ms	480.06 ms	11.78 ms
75774ea	454.16 ms	467.80 ms	13.64 ms
800171e	479.44 ms	462.86 ms	-16.58 ms

App size

Revision	Plain	With Sentry	Diff
83f6f6c	17.74 MiB	20.09 MiB	2.35 MiB
8c88ac7	17.74 MiB	20.08 MiB	2.34 MiB
baa882f	17.73 MiB	20.06 MiB	2.33 MiB
12427f4	17.73 MiB	19.85 MiB	2.12 MiB
c830127	17.74 MiB	20.10 MiB	2.36 MiB
5571a20	17.73 MiB	19.93 MiB	2.19 MiB
700cbf4	17.73 MiB	20.07 MiB	2.33 MiB
690220d	17.74 MiB	20.08 MiB	2.35 MiB
75774ea	17.74 MiB	20.08 MiB	2.35 MiB
800171e	17.75 MiB	20.11 MiB	2.36 MiB

[antonis]

LGTM 🚀

[github-actions]

Android (new) Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	390.87 ms	433.86 ms	42.99 ms
Size	7.15 MiB	8.38 MiB	1.23 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
5446992+dirty	371.61 ms	390.00 ms	18.39 ms
9282172+dirty	363.57 ms	399.78 ms	36.20 ms
86d6d2c+dirty	267.21 ms	325.24 ms	58.04 ms
5571a20+dirty	359.52 ms	389.80 ms	30.28 ms
9a3ca65+dirty	344.96 ms	358.92 ms	13.96 ms
700cbf4+dirty	411.71 ms	485.52 ms	73.81 ms
80b2ce3+dirty	271.29 ms	316.47 ms	45.18 ms
abb7058+dirty	320.78 ms	324.08 ms	3.30 ms
70caa60+dirty	308.83 ms	393.06 ms	84.23 ms
5f03ae9+dirty	375.36 ms	401.26 ms	25.90 ms

App size

Revision	Plain	With Sentry	Diff
5446992+dirty	7.15 MiB	8.12 MiB	999.45 KiB
9282172+dirty	7.15 MiB	8.37 MiB	1.22 MiB
86d6d2c+dirty	7.15 MiB	8.09 MiB	962.69 KiB
5571a20+dirty	7.15 MiB	8.20 MiB	1.05 MiB
9a3ca65+dirty	7.15 MiB	8.09 MiB	962.83 KiB
700cbf4+dirty	7.15 MiB	8.34 MiB	1.19 MiB
80b2ce3+dirty	7.15 MiB	8.04 MiB	911.02 KiB
abb7058+dirty	7.15 MiB	8.10 MiB	980.40 KiB
70caa60+dirty	7.15 MiB	8.03 MiB	901.79 KiB
5f03ae9+dirty	7.15 MiB	8.38 MiB	1.23 MiB