[release/2.7] Removing --user flag from all pip install commands

[ethanwee1]

From upstream PR pytorch#154900
Resolves:https://ontrack-internal.amd.com/browse/SWDEV-536994

After following steps to reproduce in container registry-sc-harbor.amd.com/framework/compute-rocm-dkms-no-npi-hipclang:16231_ubuntu22.04_py3.10_pytorch_lw_release2.7_no_user_66a18277:

root@ubb4-rack-22:/var/lib/jenkins/pytorch# history
    1  cd /var/lib/jenkins/pytorch
    2  TEST_CONFIG=default CONTINUE_THROUGH_ERROR=True .ci/pytorch/test.sh

 Name:                    gfx90a
  Marketing Name:          AMD Instinct MI250X/MI250
+ MAYBE_ROCM=rocm/
+ [[ rocm == *xpu* ]]
+ [[ rocm != *-bazel-* ]]
+ pip_install ninja==1.10.2
+ pip_install_pkg='python3 -m pip install --progress-bar off'
+ python3 -m pip install --progress-bar off ninja==1.10.2
Collecting ninja==1.10.2
  Downloading ninja-1.10.2-py2.py3-none-manylinux_2_5_x86_64.manylinux1_x86_64.whl.metadata (5.0 kB)
Downloading ninja-1.10.2-py2.py3-none-manylinux_2_5_x86_64.manylinux1_x86_64.whl (108 kB)
Installing collected packages: ninja
  Attempting uninstall: ninja
    Found existing installation: ninja 1.11.1.4
    Uninstalling ninja-1.11.1.4:
      Successfully uninstalled ninja-1.11.1.4
Successfully installed ninja-1.10.2
+ export PATH=/root/.local/bin:/opt/venv/bin:/opt/rocm/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+ PATH=/root/.local/bin:/opt/venv/bin:/opt/rocm/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+ [[ rocm == *aarch64* ]]
+ [[ rocm == *asan* ]]
+ [[ rocm == *-debug* ]]
+ [[ rocm != *-bazel-* ]]
+ echo 'We are not in debug mode: rocm. Expect the assertion to pas

http://rocm-ci.amd.com/job/mainline-pytorch2.7-manylinux-wheels/126/

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