Avoid unused NetEventSource code

[MihaZupan]

Fixes#54859

• Removed a copy of NetEventSource.Common.cs from the aspnetcore shared folder - completely unused
• Split of Associate and DumpBuffer methods into separate partial files that are optionally included by projects that actually use them
• Removed as many constants and code from the NetEventSource.Common where possible (e.g. only used by a single project)
• Moved some Windows-specific logging code out of the shared class
• Removed a bunch of redundant IsEnabled checks

Release assembly sizes:

Windows (-10 KB):

Assembly	Before	After	Diff
System.Net.Http.dll	632320	631808	-512
System.Net.Http.WinHttpHandler.dll	136704	130560	-6144
System.Net.HttpListener.dll	269312	268288	-1024
System.Net.NetworkInformation.dll	76288	74752	-1536
System.Net.Security.dll	248832	247808	-1024

Linux: (-3.5 KB)

Assembly	Before	After	Diff
System.Net.Http.dll	622080	621568	-512
System.Net.HttpListener.dll	121856	121344	-512
System.Net.NetworkInformation.dll	82432	80896	-1536
System.Net.Security.dll	301056	300544	-512
System.Net.Sockets.dll	218624	218112	-512

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Issue Details

---

Fixes #54859

• Removed a copy of NetEventSource.Common.cs from the aspnetcore shared folder - completely unused
• Split of Associate and DumpBuffer methods into separate partial files that are optionally included by projects that actually use them
• Removed as many constants and code from the NetEventSource.Common where possible (e.g. only used by a single project)
• Moved some Windows-specific logging code out of the shared class
• Removed a bunch of redundant IsEnabled checks

Release assembly sizes:

Windows (-10 KB):

Assembly	Before	After	Diff
System.Net.Http.dll	632320	631808	-512
System.Net.Http.WinHttpHandler.dll	136704	130560	-6144
System.Net.HttpListener.dll	269312	268288	-1024
System.Net.NetworkInformation.dll	76288	74752	-1536
System.Net.Security.dll	248832	247808	-1024

Linux:
ToDo

Author:	MihaZupan
Assignees:	-
Labels:	area-System.Net
Milestone:	-

[MihaZupan]

/azp run runtime-libraries-coreclr outerloop

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[CarnaViire]

Will you update the PR soon @MihaZupan ? 😄

[MihaZupan]

Yes, just waiting for VS to update :)

Soon™️

[CarnaViire]

LGTM, thanks!

[MihaZupan]

/azp run runtime-libraries-coreclr outerloop

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[MihaZupan]

Restarting CI after #73962

Regular CI was already clean.

I see no networking outerloop failures now.

[MihaZupan]

/azp run runtime-libraries-coreclr outerloop

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).