tests,misc: Removing cloudbuild_presubmit.yaml
tests,misc: Removing cloudbuild_presubmit.yaml

This is not used. It can be removed.

Change-Id: I2e25a5407ca70a18b4e619f4e65b69b98c873511
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/38375
Reviewed-by: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Maintainer: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5