[release/8.0] HttpClient logging based on new .NET 8 runtime APIs (#4224)

[xakep139]

• use new .NET 8 runtime APIs in HttpClient logging (HttpClient logging based on new .NET 8 runtime APIs #4224)

• Leverage KeyedServices feature in HttpClient logging (Leverage KeyedServices feature in HttpClient logging #4253)

Microsoft Reviewers: Open in CodeFlow

[joperezr]

@xakep139 and @geeknoid , for future reference, merges in the direction: 8.0-rc1 -> 8.0 -> main are done automatically, and for the opposite direction (which is the case of this PR), you can now just add a comment on the original PR with a request to backport and the backport will be done automatically for you. Here is an example of when I used it for moving one change from 8.0 -> 8.0-rc1 #4287 (comment)

Essentially you just add a comment on the PR with the following format: /backport to <branchYouWantToBackportTo>

[xakep139]

@joperezr thanks for the hint! I was aware of the automatic merges from 8.0 -> main, but didn't know about the /backport command.