Make PEM heap dump scripts compatible with Kelvin

[ddelnano]

Summary: Make PEM heap dump scripts compatible with Kelvin

A community member reported their kelvin instances having a significantly large memory footprint. This updates our existing tooling to support kelvin to aid debugging these types of issues.

Relevant Issues: N/A

Type of change: /kind feature

Test Plan: Ran the heap dump script for a single node cluster (1 PEM, 1 Kelvin) and verified the pprofs rendered in a browser

$ ./scripts/collect_heap_pprofs.sh new_test  97838d18-bfa1-4ee4-9ee5-28332354c994 --gcloud-common-args '--project=csmc-dev' --gcloud-ssh-args '--internal-ip'

Wrote heap profile for ASID 3 on host gke-dev-cluster-ddelnano-default-pool-193a440d-1fz9 to new_test/gke-dev-cluster-ddelnano-default-pool-193a440d-1fz9-3.txt
Wrote heap profile for ASID 1 on host gke-dev-cluster-ddelnano-default-pool-193a440d-1fz9 to new_test/gke-dev-cluster-ddelnano-default-pool-193a440d-1fz9-1.txt
Using PID (11548) of /app/src/vizier/services/agent/kelvin/kelvin.runfiles/px/src/vizier/services/agent/kelvin/kelvin
Dumped mapped binaries to new_test/gke-dev-cluster-ddelnano-default-pool-193a440d-1fz9-1
Run 'PPROF_BINARY_PATH=new_test/gke-dev-cluster-ddelnano-default-pool-193a440d-1fz9-1 pprof -http=localhost:8888 new_test/gke-dev-cluster-ddelnano-default-pool-193a440d-1fz9-1.txt' to visualize the profile.
Using PID (761750) of /app/src/vizier/services/agent/pem/pem.runfiles/px/src/vizier/services/agent/pem/pem
Dumped mapped binaries to new_test/gke-dev-cluster-ddelnano-default-pool-193a440d-1fz9-3
Run 'PPROF_BINARY_PATH=new_test/gke-dev-cluster-ddelnano-default-pool-193a440d-1fz9-3 pprof -http=localhost:8888 new_test/gke-dev-cluster-ddelnano-default-pool-193a440d-1fz9-3.txt' to visualize the profile.