Adaptive Performance Samples are using the obsolete "FindFirstObjectByType" method

Steps to reproduce:

1. Create a new 3D URP package
2. Open the Package Manager
3. Install the Adaptive Performance package (com.unity.adaptiveperformance)
4. Navigate to the Samples tab
5. Import the "Environment" sample
6. Observe the Console once imported

Actual results: No warnings are shown

Expected results: "FindFirstObjectByType is obsolete" warnings are shown

Reproducible with versions: 6.0.0 (6000.4.3f1, 6000.5.0b4, 6000.6.0a3)

Not reproducible with versions: 6000.3.13f1 (Method is not obsolete) 

Tested on (OS): Ubuntu 24.04, macOS 26.3

Warnings:

• Assets/Samples/Adaptive Performance/6.0.0/Environment/AutoPerfControl.cs(222,49): warning CS0618: 'Object.FindFirstObjectByType<T>()' is obsolete
• es/Adaptive Performance/6.0.0/Environment/AutoPerfControl.cs(227,48): warning CS0618: 'Object.FindFirstObjectByType<T>()' is obsolete