Set transactionNameSource to CUSTOM when setting transaction name

[adinauer]

📜 Description

Set source to CUSTOM when setting transaction name without source

💡 Motivation and Context

Transaction name could be set by user and previously set source would be kept.

💚 How did you test it?

Unit Test

📝 Checklist

• I reviewed the submitted code
• I added tests to verify the changes
• I updated the docs if needed
• No breaking changes

🔮 Next steps

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	353.79 ms	378.26 ms	24.47 ms
Size	1.73 MiB	2.32 MiB	612.47 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
f809aac	301.51 ms	346.60 ms	45.09 ms
81a1a6c	328.73 ms	421.28 ms	92.55 ms
4a9c176	319.77 ms	363.20 ms	43.43 ms
3695453	299.25 ms	360.04 ms	60.79 ms
7967d22	289.28 ms	377.11 ms	87.83 ms
507f924	342.51 ms	402.65 ms	60.14 ms
4a9c176	336.33 ms	384.73 ms	48.41 ms
3695453	314.63 ms	353.10 ms	38.47 ms
38e4f11	358.20 ms	433.73 ms	75.53 ms
16371c5	314.02 ms	394.54 ms	80.52 ms

App size

Revision	Plain	With Sentry	Diff
f809aac	1.73 MiB	2.32 MiB	608.63 KiB
81a1a6c	1.73 MiB	2.32 MiB	612.47 KiB
4a9c176	1.73 MiB	2.33 MiB	612.69 KiB
3695453	1.73 MiB	2.32 MiB	611.62 KiB
7967d22	1.73 MiB	2.32 MiB	612.47 KiB
507f924	1.73 MiB	2.32 MiB	609.95 KiB
4a9c176	1.73 MiB	2.33 MiB	612.69 KiB
3695453	1.73 MiB	2.32 MiB	611.62 KiB
38e4f11	1.73 MiB	2.32 MiB	609.82 KiB
16371c5	1.73 MiB	2.32 MiB	611.62 KiB

[marandaneto]

Do we call this method internally?
If we do, we cannot overwrite to custom, only if the user does.

[adinauer]

Good point will check. But if so we could simply change our code to use the other overload.

[adinauer]

Couldn't find any direct calls to this overload (outside of tests).

[adinauer]

Should we check cross platform SDKs before merging this?

[adinauer]

@marandaneto should we check any SDKs first or can I go ahead and merge this PR?

[marandaneto]

LGTM