Backport of #123779 to release/10.0

/cc @mdh1418

## Customer Impact

- [ ] Customer reported
- [x] Found internally

User_events support was added in .NET 10. The officially supported way
to enable user_events is through One-Collect's
[record-trace](https://github.com/microsoft/one-collect) (which
dotnet-trace wraps around). Record-trace relied on an implementation
detail of W^X that NativeAOT doesn't support since it doesn't support
PerfMaps (see microsoft/one-collect#226), so
it was belatedly discovered that user_events doesn't work for NativeAOT.

Through discussions in
microsoft/one-collect#226, this
`dotnet_ipc_created` mapping with no permissions (PROT_NONE) was found
as an acceptable minimal OS interaction to signal when the .NET process'
diagnostic ports are available.

## Regression

- [ ] Yes
- [x] No

## Testing

I tested the [User_events runtime
tests](https://github.com/dotnet/runtime/tree/main/src/tests/tracing/userevents)
against a locally built record-trace based on
microsoft/one-collect#229 in both CoreCLR and
NativeAOT on my WSL2 instance.

## Risk

Low. The mapping being introduced has minimal permissions as it is a
private mapping created with `PROT_NONE`.

---------

Co-authored-by: mdh1418 <mitchhwang1418@gmail.com>

External tools interested in connecting to the runtime's diagnostic
ports benefit from a low-overhead IO signal that a .NET process is ready
to receive IPC commands, instead of trying to IO over all known temp
file directories looking for diagnostic ports for each process.

Following the discussion in
microsoft/one-collect#226, this PR adds a new
mapping, `dotnet_ipc_created`, that is created once a .NET process'
singular listen port is successfully created.

## Testing

userevents runtime tests now work on NativeAOT with the record-trace
change microsoft/one-collect#229
```
mihw@CPC-mihw-6KMZDM:~/repo/runtime$ ./artifacts/tests/coreclr/linux.x64.Release/tracing/userevents/basic/basic/basic.sh
BEGIN EXECUTION
/home/mihw/repo/runtime/src/tests/Common/scripts/nativeaottest.sh /home/mihw/repo/runtime/artifacts/tests/coreclr/linux.x64.Release/tracing/userevents/basic/basic/ basic.dll ''
traceeAssemblyPath:
Starting record-trace: sudo -n /home/mihw/repo/runtime/artifacts/tests/coreclr/linux.x64.Release/tracing/userevents/common/userevents_common/record-trace --script-file /home/mihw/repo/runtime/artifacts/tests/coreclr/linux.x64.Release/tracing/userevents/basic/basic/native/../basic.script --out /tmp/tmpBoli5K.nettrace --log-mode console --log-filter error,one_collect::helpers::dotnet::os::linux=debug
record-trace started with PID: 1543079
[record-trace] 2026-01-29T22:55:19.967428Z DEBUG one_collect::helpers::dotnet::os::linux: Registered .NET tracepoint: name=OC_DotNet_Microsoft_Windows_DotNETRuntime_1543081_All, callstacks=false, use_names=true
Starting tracee process: /home/mihw/repo/runtime/artifacts/tests/coreclr/linux.x64.Release/tracing/userevents/basic/basic/native/basic tracee
Tracee process started with PID: 1543083
Waiting for tracee process to exit...
[record-trace] 2026-01-29T22:55:20.093460Z DEBUG one_collect::helpers::dotnet::os::linux: Opened diagnostic socket: pid=1543063, nspid=1543063
[record-trace] 2026-01-29T22:55:20.093476Z DEBUG one_collect::helpers::dotnet::os::linux: Opened diagnostic socket: pid=1543063, nspid=1543063
[record-trace] 2026-01-29T22:55:20.094446Z DEBUG one_collect::helpers::dotnet::os::linux: Opened diagnostic socket: pid=1543063, nspid=1543063
[record-trace] Recording started.  Press CTRL+C to stop.
[record-trace] 2026-01-29T22:55:20.097795Z  INFO one_collect::helpers::dotnet::os::linux: Enabled .NET events for process: pid=1543063
[record-trace] 2026-01-29T22:55:20.098955Z DEBUG one_collect::helpers::dotnet::os::linux: Opened diagnostic socket: pid=1543083, nspid=1543083
[record-trace] 2026-01-29T22:55:20.099085Z DEBUG one_collect::helpers::dotnet::os::linux: Opened diagnostic socket: pid=1543083, nspid=1543083
[record-trace] 2026-01-29T22:55:20.100017Z DEBUG one_collect::helpers::dotnet::os::linux: Opened diagnostic socket: pid=1543083, nspid=1543083
[record-trace] 2026-01-29T22:55:20.104842Z  INFO one_collect::helpers::dotnet::os::linux: Enabled .NET events for process: pid=1543083
Stopping record-trace with SIGINT.
Waiting for record-trace to exit...
[record-trace] Recording stopped.
[record-trace] Resolving symbols.
[record-trace] Finished recording trace.
[record-trace] Trace written to /tmp/tmpBoli5K.nettrace
Expected: 100
Actual: 100
END EXECUTION - PASSED
```