runtime-live-build timed out

[eerhardt]

I got this failure on my PR #43454

See https://dev.azure.com/dnceng/public/_build/results?buildId=863438&view=results

The whole build failed, but each Job passed:

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[ViktorHofer]

@safern can we increase the timeout for runtime-live-build steps to 90min?

[safern]

Yeah. This was very close to the limit and it seems like teardown time that the agent takes, caused the timeout. I'll increase the timeout.