fix(logger): fallback to distinct-id when user is not set

[markushi]

When no user is set in the scope, the logger now falls back to using the distinct ID (installation ID on Android) as the user ID in log attributes. This ensures logs always have a user identifier when available - and it also matches the DefaultAndroidEventProcessor behavior.

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	311.09 ms	377.89 ms	66.80 ms
Size	1.58 MiB	2.12 MiB	551.50 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
27d7cf8	309.43 ms	364.27 ms	54.85 ms
3d205d0	352.15 ms	432.53 ms	80.38 ms
ee747ae	554.98 ms	611.50 ms	56.52 ms
ce0a49e	532.00 ms	609.96 ms	77.96 ms
b3d8889	420.46 ms	453.71 ms	33.26 ms
27d7cf8	306.76 ms	366.66 ms	59.90 ms
806307f	357.85 ms	424.64 ms	66.79 ms
c8125f3	397.65 ms	485.14 ms	87.49 ms
d5a29b6	298.62 ms	391.78 ms	93.16 ms
d364ace	384.53 ms	453.51 ms	68.98 ms

App size

Revision	Plain	With Sentry	Diff
27d7cf8	1.58 MiB	2.12 MiB	549.42 KiB
3d205d0	1.58 MiB	2.10 MiB	532.97 KiB
ee747ae	1.58 MiB	2.10 MiB	530.95 KiB
ce0a49e	1.58 MiB	2.10 MiB	532.94 KiB
b3d8889	1.58 MiB	2.10 MiB	535.07 KiB
27d7cf8	1.58 MiB	2.12 MiB	549.42 KiB
806307f	1.58 MiB	2.10 MiB	533.42 KiB
c8125f3	1.58 MiB	2.10 MiB	532.32 KiB
d5a29b6	1.58 MiB	2.12 MiB	549.37 KiB
d364ace	1.58 MiB	2.11 MiB	539.75 KiB

Previous results on branch: markushi/fix/missing-user-id

Startup times

Revision	Plain	With Sentry	Diff
a097a34	341.23 ms	421.35 ms	80.12 ms
e4c8522	318.31 ms	374.80 ms	56.49 ms

App size

Revision	Plain	With Sentry	Diff
a097a34	1.58 MiB	2.12 MiB	551.51 KiB
e4c8522	1.58 MiB	2.12 MiB	551.40 KiB

[markushi]

@sentry review