Add Logs info to OTel docs

[ProgrammerAL]

• Updated /identityserver/diagnostics/otel page to detail how logs can be exported to OTel traces
  • Added the OpenTelemetry Signals header towards the top to group signals together (traces, logs, metrics)
  • Switch Traces and Logs categories
  • Added some images to show logs in a trace in Aspire
• Updated /identityserver/diagnostics/logging page to include a blurb about logging OTel info in the otel page

Fixes #973

[maartenba]

Small change suggested to code sample.

Does this also work with Serilog? (given how https://github.com/orgs/DuendeSoftware/discussions/451#discussioncomment-15453156 is hooking things up directly)

[ProgrammerAL]

@maartenba The code sample in that GitHub Issue is specific to Serilog. The code sample in this PR is generic to ASP.NET Core for anyone using ILogger. I can include that Serilog specific sample, but if we do that should we also include samples for other logging frameworks?

[maartenba]

We have Serilog in many other places (it's the default in our templates) so makes sense to add imo. Also feel free to cross-reference to (and from) https://docs.duendesoftware.com/general/logging/#setup-for-serilog

[ProgrammerAL]

@maartenba Added a blurb at the bottom of src/content/docs/identityserver/diagnostics/otel.md for logging to OTel using the Serilog specific API. Let me know what you think.

[maartenba]

Perfect! Merge at will. Thanks @ProgrammerAL !