### Summary

 ansible [core 2.13.0.dev0] is giving wrong `discovered_interpreter_python`. Here is a comparison from same host for 2.12.1 and 2.13

```
[root@perfscale-jenkins-max-control-11-exec-controlplane-1-vsi ansible-tower-setup]# ansible --version
[WARNING]: You are running the development version of Ansible. You should only run Ansible from "devel" if you are modifying the Ansible engine, or trying out features under development. This is a rapidly
changing source of code and can become unstable at any point.
ansible [core 2.13.0.dev0]
  config file = /root/ansible-tower-setup/ansible.cfg
  configured module search path = ['/root/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3.9/site-packages/ansible
  ansible collection location = /root/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/bin/ansible
  python version = 3.9.2 (default, Mar  5 2021, 01:49:45) [GCC 8.4.1 20200928 (Red Hat 8.4.1-1)]
  jinja version = 3.0.3
  libyaml = True
[root@perfscale-jenkins-max-control-11-exec-controlplane-1-vsi ansible-tower-setup]# ansible -i inventory.cluster automationcontroller -m setup | grep -i discovered_interpreter_python
[WARNING]: You are running the development version of Ansible. You should only
run Ansible from "devel" if you are modifying the Ansible engine, or trying out
features under development. This is a rapidly changing source of code and can
become unstable at any point.
[WARNING]: Platform linux on host xx.xx.xx.xx is using the discovered
Python interpreter at /usr/bin/python3.9, but future installation of another
Python interpreter could change the meaning of that path. See
https://docs.ansible.com/ansible-
core/devel/reference_appendices/interpreter_discovery.html for more
information.
        "discovered_interpreter_python": "/usr/bin/python3.9",
```

In 2.12.1

```
[root@perfscale-jenkins-max-control-11-exec-controlplane-1-vsi ansible-tower-setup]# ansible --version
ansible [core 2.12.1]
  config file = /root/ansible-tower-setup/ansible.cfg
  configured module search path = ['/root/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3.8/site-packages/ansible
  ansible collection location = /root/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/bin/ansible
  python version = 3.8.6 (default, Jan 22 2021, 11:41:28) [GCC 8.4.1 20200928 (Red Hat 8.4.1-1)]
  jinja version = 2.10.3
  libyaml = True
[root@perfscale-jenkins-max-control-11-exec-controlplane-1-vsi ansible-tower-setup]# ansible -i inventory.cluster automationcontroller -m setup | grep -i discovered_interpreter_python
        "discovered_interpreter_python": "/usr/libexec/platform-python",
```

### Issue Type

Bug Report

### Component Name

setup

### Ansible Version

```console
$ ansible --version
ansible [core 2.13.0.dev0]
  config file = /root/ansible-tower-setup/ansible.cfg
  configured module search path = ['/root/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3.9/site-packages/ansible
  ansible collection location = /root/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/bin/ansible
  python version = 3.9.2 (default, Mar  5 2021, 01:49:45) [GCC 8.4.1 20200928 (Red Hat 8.4.1-1)]
  jinja version = 3.0.3
  libyaml = True
```


### Configuration

```console
$ ansible-config dump --only-changed
```


### OS / Environment

RHEL 8.4

### Steps to Reproduce

<!--- Paste example playbooks or commands between quotes below -->
```
Try to run the setup module and look for `discovered_interpreter_python`

```


### Expected Results
```console
"discovered_interpreter_python": "/usr/libexec/platform-python"
```
### Actual Results

```console
"discovered_interpreter_python": "/usr/bin/python3.9"
```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
if not os.path.exists(path):
        return False
    
    if allow_empty:
        return True
    
    if os.path.getsize(path) == 0:
        return False
    
    return True
class DistributionFiles:
    '''has-a various distro file parsers (os-release, etc) and logic for finding the right one.'''
    
    
    
    
    
    OSDIST_LIST = (
        {'path': '/etc/altlinux-release', 'name': 'Altlinux'},
        {'path': '/etc/oracle-release', 'name': 'OracleLinux'},
        {'path': '/etc/slackware-version', 'name': 'Slackware'},
        {'path': '/etc/centos-release', 'name': 'CentOS'},
        {'path': '/etc/redhat-release', 'name': 'RedHat'},
        {'path': '/etc/vmware-release', 'name': 'VMwareESX', 'allowempty': True},
        {'path': '/etc/openwrt_release', 'name': 'OpenWrt'},
        {'path': '/etc/os-release', 'name': 'Amazon'},