agdtunnel crashes on Oppo Android 8.1

hey,

Looks like agdktunnel is accessing non existant java functions on Oppo Android 8.1:

```
24-07-11 13:13:13.017 3199-9231 Auth com.google.android.gms.persistent W [GaiaIdSync] Empty email or accountId. [CONTEXT service_id=153 ]
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] JNI DETECTED ERROR IN APPLICATION: JNI CallStaticObjectMethodV called with pending exception java.lang.NoSuchMethodError: no static method "Landroid/os/VibrationEffect;.createPredefined(I)Landroid/os/VibrationEffect;"
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] (Throwable with empty stack trace)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534]
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] in call to CallStaticObjectMethodV
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] "Thread-3" prio=10 tid=12 Runnable
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] | group="main" sCount=0 dsCount=0 flags=0 obj=0x18e80000 self=0x72ebe31c00
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] | sysTid=9469 nice=-10 cgrp=default sched=0/0 handle=0x72d534b4f0
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] | state=R schedstat=( 54996358 48000880 159 ) utm=4 stm=1 core=6 HZ=100
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] | stack=0x72d5251000-0x72d5253000 stackSize=1005KB
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] | held mutexes= "mutator lock"(shared held)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #00 pc 00000000003ca7bc /system/lib64/libart.so (art::DumpNativeStack(std::__1::basic_ostream>&, int, BacktraceMap*, char const*, art::ArtMethod*, void*)+208)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #01 pc 000000000049d098 /system/lib64/libart.so (art::Thread::DumpStack(std::__1::basic_ostream>&, bool, BacktraceMap*, bool) const+348)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #02 pc 00000000002fd578 /system/lib64/libart.so (art::JavaVMExt::JniAbort(char const*, char const*)+1048)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #03 pc 00000000002fd968 /system/lib64/libart.so (art::JavaVMExt::JniAbortV(char const*, char const*, std::__va_list)+116)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #04 pc 000000000010e74c /system/lib64/libart.so (art::ScopedCheck::AbortF(char const*, ...)+148)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #05 pc 000000000010e29c /system/lib64/libart.so (art::ScopedCheck::CheckThread(_JNIEnv*)+516)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #06 pc 000000000010c74c /system/lib64/libart.so (art::ScopedCheck::Check(art::ScopedObjectAccess&, bool, char const*, art::JniValueType*)+644)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #07 pc 0000000000111bc8 /system/lib64/libart.so (art::CheckJNI::CheckCallArgs(art::ScopedObjectAccess&, art::ScopedCheck&, _JNIEnv*, _jobject*, _jclass*, _jmethodID*, art::InvokeType, art::VarArgs const*)+132)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #08 pc 0000000000110a80 /system/lib64/libart.so (art::CheckJNI::CallMethodV(char const*, _JNIEnv*, _jobject*, _jclass*, _jmethodID*, std::__va_list, art::Primitive::Type, art::InvokeType)+664)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #09 pc 0000000000100ae8 /system/lib64/libart.so (art::CheckJNI::CallStaticObjectMethodV(_JNIEnv*, _jclass*, _jmethodID*, std::__va_list)+92)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #10 pc 00000000001c5ab0 /data/app/com.google.sample.agdktunnel-w-oH2ieoY6b5dJeOCKLR1Q==/base.apk (???)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #11 pc 00000000001c5cd8 /data/app/com.google.sample.agdktunnel-w-oH2ieoY6b5dJeOCKLR1Q==/base.apk (???)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #12 pc 00000000001f6b88 /data/app/com.google.sample.agdktunnel-w-oH2ieoY6b5dJeOCKLR1Q==/base.apk (???)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #13 pc 00000000001f3d48 /data/app/com.google.sample.agdktunnel-w-oH2ieoY6b5dJeOCKLR1Q==/base.apk (???)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #14 pc 00000000001c7068 /data/app/com.google.sample.agdktunnel-w-oH2ieoY6b5dJeOCKLR1Q==/base.apk (???)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #15 pc 00000000001feaf8 /data/app/com.google.sample.agdktunnel-w-oH2ieoY6b5dJeOCKLR1Q==/base.apk (???)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #16 pc 0000000000074d78 /system/lib64/libc.so (__pthread_start(void*)+36)
2024-07-11 13:13:13.042 9365-9469 zygote64 com.google.sample.agdktunnel A java_vm_ext.cc:534] native: #17 pc 000000000001fce4 /system/lib64/libc.so (__start_thread+68)
```

[CrashOppoAndroid8.1.txt](https://github.com/user-attachments/files/21100369/CrashOppoAndroid8.1.txt)

Start by examining the agdtunnel code path that calls VibrationEffect.createPredefined(I), then reproduce the crash on Oppo Android 8.1 using the supplied CrashOppoAndroid8.1.txt log as a reference. Done means agdtunnel no longer crashes when this API is unavailable on that device; the issue does not name a source file or test to run.

Written by the indexing model from the issue text.