Share common Uri redaction logic in Http

[MihaZupan]

We had duplicate logic between the client factory and http, and the Redirect redaction was different (didn't account for user info & fragment).

This makes all the places share the same logic.

[Copilot]

Copilot reviewed 9 out of 12 changed files in this pull request and generated no comments.

Files not reviewed (3)

• src/libraries/Microsoft.Extensions.Http/src/Microsoft.Extensions.Http.csproj: Language not supported
• src/libraries/System.Net.Http/src/System.Net.Http.csproj: Language not supported
• src/libraries/System.Net.Http/tests/UnitTests/System.Net.Http.Unit.Tests.csproj: Language not supported

Comments suppressed due to low confidence (1)

src/libraries/System.Net.Http/tests/FunctionalTests/TelemetryTest.cs:937

• [nitpick] Verify that the computed expectedUriTail correctly reflects the updated redaction behavior (i.e. excluding any URI fragments) and aligns with the new centralized logic in UriRedactionHelper.

string expectedUriTail = uriTail;

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