[lldb][Telemetry] Fix unit test compile failure with LLVM_ENABLE_TELEMETRY=0 (#136115)

It needs to be `TEST_F` to access `received_entries`.
Disabling also works based on the test not the fixture name.

Build failure:
```
lldb/unittests/Core/TelemetryTest.cpp:110:17: error: use of undeclared identifier 'received_entries'
  110 |   ASSERT_EQ(1U, received_entries.size());
      |                 ^
lldb/unittests/Core/TelemetryTest.cpp:112:61: error: use of undeclared identifier 'received_entries'
  112 |             llvm::dyn_cast<lldb_private::FakeTelemetryInfo>(received_entries[0])
      |                                                             ^
```

Fixes: 159b872b37363511a359c800bcc9230bb09f2457

0 files changed, 0 insertions, 0 deletions