Add timeout default in NeutronBackend (#21293)

[JakeStevens]

Summary:

The driver header specifies "60" as a default but is never set.

Here, we set the default accordingly.

Without a default, there is a crash in our specific setup.

This may because ET allocates the object, but does not memset or anything so there may be garbage values that negatively impact.

Reviewed By: rascani

Differential Revision: D113453148

[pytorch-bot]

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✅ You can merge normally! (1 Unrelated Failure)

As of commit f446938 with merge base 30bf6af ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / unittest-wasm-bindings (--enable-etdump) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128

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[meta-codesync]

@JakeStevens has exported this pull request. If you are a Meta employee, you can view the originating Diff in D113453148.

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[rascani]

Review automatically exported from Phabricator review in Meta.

[jirioc]

Note that the timeout is not applicable to RT700, it applies to Neutron-S architectures where the inference can be invoked in the non-blocking mode.