[Startup] Bump PerfMap ahead of DiagnosticServer (#123226)

Fixes #122472

From some inspection, it looks like `PerfMap::Initialize` does not
depend on the methods right above it.
```
#ifdef FEATURE_PERFTRACING
        DiagnosticServerAdapter::Initialize();
        DiagnosticServerAdapter::PauseForDiagnosticsMonitor();
#endif // FEATURE_PERFTRACING

#ifdef FEATURE_GDBJIT
        // Initialize gdbjit
        NotifyGdb::Initialize();
#endif // FEATURE_GDBJIT

#ifdef FEATURE_EVENT_TRACE
        // Initialize event tracing early so we can trace CLR startup time events.
        InitializeEventTracing();

        // Fire the EE startup ETW event
        ETWFireEvent(EEStartupStart_V1);
#endif // FEATURE_EVENT_TRACE

        InitGSCookie();

#ifdef LOGGING
        InitializeLogging()
#endif
```
`PerfMap::Initialize` depends on `SString::Startup()` which occurs
earlier in startup and some PAL/OS services.

Instead of adding more logic to handle a racing DiagnosticServer IPC
[`EnablePerfMap`
command](https://github.com/dotnet/diagnostics/blob/main/documentation/design-docs/ipc-protocol.md#enableperfmap)
and `PerfMap::Initialize` (e.g. lazy-init/queued commands), bump the
PerfMap initialization ahead of the DiagnosticServer initialization. The
DiagnosticServer also doesn't depend on PerfMap being initialized
afterwards, and PerfMap's `CrstStatic` and `PerfMap::Enable(type,
sendExisting)` suggests that the IPC enable perfmap command should occur
after `PerfMap::Initialize`.

This way, DiagnosticServer is still early in startup, and its
`PerfMap::Enable` will not crash the runtime.
As for the IPC command to set environment variables, it is unlikely that
it was used to `DOTNET_PerfMapEnabled` because that would either not
have applied early enough or have crashed the runtime like in the issue.
Instead, the `EnablePerfMap`/`DisablePerfMap` commands should be used to
toggle PerfMap status.

Author: mdh1418

src/coreclr/vm/ceemain.cpp

@@ -706,6 +706,10 @@ void EEStartupHelper()
         }
 #endif
 
+#ifdef FEATURE_PERFMAP
+        PerfMap::Initialize();
+#endif
+
 #ifdef FEATURE_PERFTRACING
         DiagnosticServerAdapter::Initialize();
         DiagnosticServerAdapter::PauseForDiagnosticsMonitor();
@@ -731,7 +735,6 @@ void EEStartupHelper()
 #endif
 
 #ifdef FEATURE_PERFMAP
-        PerfMap::Initialize();
         InitThreadManagerPerfMapData();
 #endif