Fix(devenv): use #!/usr/bin/env for bash scripts (#95117)

This solves problems on Linux distros like NixOS and BSDs like FreeBSD that don't provide `/bin/bash`, while also
maintaining support for all other distros out there (AFAIK? even Alpine with its Busybox has /usr/bin/env).

devenv/bulk-folders/bulk-folders.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 echo "Deleting previous bulk folders"
 find ./bulk-folders -type d -name "Bulk Folder*" -exec rm -rf "{}" \;

devenv/create_docker_compose.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 blocks_dir=docker/blocks
 docker_dir=docker

devenv/setup.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 bulkDashboard() {