Add pkg voms-clients-cpp to el8 runtime image

[aandvalenzuela]

Solves unit test failures in cms-sw/cmsdist#8626 (comment) reporting:

Traceback (most recent call last):
  File "/pool/condor/dir_33737/jenkins/workspace/ib-run-pr-tests/CMSSW_13_3_X_2023-08-03-2300/bin/el8_amd64_gcc11/validateAlignments.py", line 374, in <module>
    main()
  File "/pool/condor/dir_33737/jenkins/workspace/ib-run-pr-tests/CMSSW_13_3_X_2023-08-03-2300/bin/el8_amd64_gcc11/validateAlignments.py", line 187, in main
    if not check_proxy():
  File "/pool/condor/dir_33737/jenkins/workspace/ib-run-pr-tests/CMSSW_13_3_X_2023-08-03-2300/bin/el8_amd64_gcc11/validateAlignments.py", line 44, in check_proxy
    subprocess.check_call(["voms-proxy-info", "--exists"],
  File "/pool/condor/dir_33737/jenkins/workspace/ib-run-pr-tests/testBuildDir/el8_amd64_gcc11/external/python3/3.9.14-70b6957a795b7a66f76d8f6fe4fa6559/lib/python3.9/subprocess.py", line 368, in check_call
    retcode = call(*popenargs, **kwargs)
  File "/pool/condor/dir_33737/jenkins/workspace/ib-run-pr-tests/testBuildDir/el8_amd64_gcc11/external/python3/3.9.14-70b6957a795b7a66f76d8f6fe4fa6559/lib/python3.9/subprocess.py", line 349, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/pool/condor/dir_33737/jenkins/workspace/ib-run-pr-tests/testBuildDir/el8_amd64_gcc11/external/python3/3.9.14-70b6957a795b7a66f76d8f6fe4fa6559/lib/python3.9/subprocess.py", line 951, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/pool/condor/dir_33737/jenkins/workspace/ib-run-pr-tests/testBuildDir/el8_amd64_gcc11/external/python3/3.9.14-70b6957a795b7a66f76d8f6fe4fa6559/lib/python3.9/subprocess.py", line 1821, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'voms-proxy-info'

[cmsbuild]

A new Pull Request was created by @aandvalenzuela (Andrea Valenzuela) for branch master.

@cmsbuild, @smuzaffar, @aandvalenzuela, @iarspider can you please review it and eventually sign? Thanks.
@perrotta, @dpiparo, @rappoccio you are the release manager for this.
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