[BUG] 3006.12: pillar.items fails silently if /srv/pillars is unreadable by salt-master's user

Description
There is 0 indication in the logs, on either salt-master or salt-minion when the /srv/pillar directory is unreadable to a non-root running salt-master. A simple salt \* pillar.items returns success with no output.

Setup
Tested in both Ubuntu 20.04 and Ubuntu 24.04 via debs https://packages.broadcom.com/

1. Install salt-master and salt-minion 3006.12
2. Run sudo mkdir /srv/pillar and sudo chmod 0750 /srv/pillar
3. Create a simple pillar.sls and top.sls in /srv/pillar/
4. Run salt-master as the salt user

• on-prem machine
• VM (Virtualbox, KVM, etc. please specify)
• VM running on a cloud service, please be explicit and add details
• container (Kubernetes, Docker, containerd, etc. please specify)
• or a combination, please be explicit
• jails if it is FreeBSD
• classic packaging
• onedir packaging
• used bootstrap to install

Steps to Reproduce the behavior

1. Run salt minion pillar.items see a success with no data.
2. Use journalctl -u salt-master and salt-minion and see no error/warning logs about /srv/pillar being unreadable.

Expected behavior
A log line in salt-master indicating that there was some issue reading /srv/pillar/.

Screenshots
N/A

Versions Report

Salt Version:
          Salt: 3006.12

Python Version:
        Python: 3.10.17 (main, Jun  9 2025, 20:41:48) [GCC 11.2.0]

Dependency Versions:
          cffi: 1.14.6
      cherrypy: unknown
  cryptography: 42.0.5
      dateutil: 2.8.1
     docker-py: Not Installed
         gitdb: Not Installed
     gitpython: Not Installed
        Jinja2: 3.1.6
       libgit2: Not Installed
  looseversion: 1.0.2
      M2Crypto: Not Installed
          Mako: Not Installed
       msgpack: 1.0.2
  msgpack-pure: Not Installed
  mysql-python: Not Installed
     packaging: 22.0
     pycparser: 2.21
      pycrypto: Not Installed
  pycryptodome: 3.19.1
        pygit2: Not Installed
  python-gnupg: 0.4.8
        PyYAML: 6.0.1
         PyZMQ: 23.2.0
        relenv: 0.19.3
         smmap: Not Installed
       timelib: 0.2.4
       Tornado: 4.5.3
           ZMQ: 4.3.4

System Versions:
          dist: ubuntu 20.04.6 focal
        locale: utf-8
       machine: x86_64
       release: 5.4.0-1118-fips
        system: Linux
       version: Ubuntu 20.04.6 focal

Additional context