Fix busybox path in plugin job with switch to `x86_64_sysroot` skaffold profile

[ddelnano]

Summary: Fix busybox path in plugin job with switch to x86_64_sysroot skaffold profile

1941 switched the cloud skaffold build to use the x86_64_sysroot profile. After that was introduced, the plugin load job no longer runs due to a missing /busybox path. This change updates the kubernetes manifests to work with the correct path.

Relevant Issues: N/A

Type of change: /kind cleanup

Test Plan: Verified the following:

• [x] Verified there is no more usage of /busybox in other k8s manifests
• [x] src/cloud/plugin/load_db:plugin_db_updater_image doesn't contain /busybox when sysroot config is used (current skaffold behavior)

  
  $ bazel run --config=x86_64_sysroot --config=stamp -c opt src/cloud/plugin/load_db:plugin_db_updater_image
  INFO: Analyzed target //src/cloud/plugin/load_db:plugin_db_updater_image (0 packages loaded, 0 targets configured).
  INFO: Found 1 target...
  Target //src/cloud/plugin/load_db:plugin_db_updater_image up-to-date:
  bazel-bin/src/cloud/plugin/load_db/plugin_db_updater_image-layer.tar
  INFO: Elapsed time: 0.396s, Critical Path: 0.03s
  INFO: 1 process: 1 internal.
  INFO: Build completed successfully, 1 total action
  INFO: Running command line: bazel-bin/src/cloud/plugin/load_db/plugin_db_updater_image.executable
  Loaded image ID: sha256:f06831dfaf1f3896d629b2919ebc004312221a616f34f164f47c92472330aced
  Tagging f06831dfaf1f3896d629b2919ebc004312221a616f34f164f47c92472330aced as bazel/src/cloud/plugin/load_db:plugin_db_updater_image

$ sudo docker run --entrypoint sh -it bazel/src/cloud/plugin/load_db:plugin_db_updater_image

ls -alh /busybox

ls: cannot access '/busybox': No such file or directory

- [x] `src/cloud/plugin/load_db:plugin_db_updater_image` does contain `/busybox` without sysroot config (previous behavior in skaffold)

$ bazel run src/cloud/plugin/load_db:plugin_db_updater_image

$ sudo docker run --entrypoint sh -it bazel/src/cloud/plugin/load_db:plugin_db_updater_image /app/src/cloud/plugin/load_db/load_db.runfiles/px # ls -alh /busybox [ ... ]

total 1M drwxr-xr-x 2 root root 12.0K Feb 27 2023 . drwxr-xr-x 1 root root 4.0K Jun 21 17:34 .. lrwxrwxrwx 1 root root 7 Feb 27 2023 [ -> busybox lrwxrwxrwx 1 root root 7 Feb 27 2023 [[ -> busybox lrwxrwxrwx 1 root root 7 Feb 27 2023 acpid -> busybox

- [x] New cloud deploy is successful