fix: disable AVM in nightly debug build and increase test timeout

The nightly barretenberg debug build has been failing since PR #21791
added test execution. Two issues:

1. The AVM=0 env var was not passed through to CMake, so vm2_tests
   were still being built and run. These AVM proving tests are too
   slow in debug mode (>10 min per test vs 600s timeout).

2. Even non-AVM tests can be slow in debug mode (-O0). Increase the
   per-test timeout from 600s to 1800s for the debug preset.

Also includes a proposed workflow timeout increase (120→240 min) in
.github-new/ since .github/ files are blocked.

Author: AztecBot

barretenberg/cpp/bootstrap.sh

@@ -59,6 +59,9 @@ function cmake_build {
   local preset=$1
   shift
   local cmake_args=()
+  if [ "${AVM:-1}" -eq 0 ]; then
+    cmake_args+=(-DAVM=OFF)
+  fi
   if [ "${AVM_TRANSPILER:-1}" -eq 0 ]; then
     cmake_args+=(-DAVM_TRANSPILER_LIB=)
   fi
@@ -244,6 +247,10 @@ function test_cmds_native {
       grep -v 'DISABLED_' | \
       while read -r test; do
         local prefix=$hash
+        # Debug builds are ~5-10x slower; give tests more time.
+        if [[ "$native_preset" == "debug" ]]; then
+          prefix="$prefix:TIMEOUT=1800s"
+        fi
         # A little extra resource for these tests.
         # IPARecursiveTests fails with 2 threads.
         if [[ "$test" =~ ^(AcirAvmRecursionConstraint|ChonkKernelCapacity|AvmRecursiveTests|IPARecursiveTests|HonkRecursionConstraintTest) ]]; then