[CD] Aarch64 builds should not override OVERRIDE_PACKAGE_VERSION envvar (pytorch#144285)

Currently our nightly aarch64 binaries have correct suffixes +cpu or +cu126. But release binaries are missing these suffixes. Hence to correct this, make sure are nightly and release binaries are consistent, I propose this change.

I see that override is already set correctly in release workflow:
https://github.com/pytorch/pytorch/actions/runs/12383179841/job/34565381200

For CPU:
```
OVERRIDE_PACKAGE_VERSION="2.6.0+cpu"
```

For CUDA:
```
OVERRIDE_PACKAGE_VERSION="2.6.0+cu126"
```

The removed code will set : OVERRIDE_PACKAGE_VERSION="2.6.0" for both cuda and cpu builds for release binaries.

Pull Request resolved: pytorch#144285
Approved by: https://github.com/malfet, https://github.com/tinglvv

Author: atalman

.ci/aarch64_linux/aarch64_ci_build.sh

@@ -6,19 +6,6 @@ GPU_ARCH_VERSION=${GPU_ARCH_VERSION:-}
 SCRIPTPATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
 source $SCRIPTPATH/aarch64_ci_setup.sh
 
-tagged_version() {
-  GIT_DESCRIBE="git --git-dir /pytorch/.git describe --tags --match v[0-9]*.[0-9]*.[0-9]*"
-  if ${GIT_DESCRIBE} --exact >/dev/null; then
-    ${GIT_DESCRIBE}
-  else
-    return 1
-  fi
-}
-
-if tagged_version >/dev/null; then
-  export OVERRIDE_PACKAGE_VERSION="$(tagged_version | sed -e 's/^v//' -e 's/-.*$//')"
-fi
-
 ###############################################################################
 # Run aarch64 builder python
 ###############################################################################