system: trust store notifications on problems

[fichtner]

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Is your feature request related to a problem? Please describe.

When certctl.py fails we don't get a very visible error. As the trust store is much more central now it makes sense to improve failure visibility.

E.g.

Error:
Traceback (most recent call last):
  File "/usr/local/opnsense/scripts/system/certctl.py", line 203, in <module>
    cmds[sys.argv[1]]()
  File "/usr/local/opnsense/scripts/system/certctl.py", line 160, in cmd_rehash
    os.symlink(src_filename, dst_filename)
FileNotFoundError: [Errno 2] No such file or directory: '/usr/share/certs/untrusted/Staat_der_Nederlanden_c' -> '/etc/ssl/blacklisted/03179a64.0'

Describe the solution you like

system_trust_configure() should tell us how it went and send a system notification to be sure.

Alternatively we could try to push errors to the crash reporter, too.

Describe alternatives you considered

N/A

Additional context

https://forum.opnsense.org/index.php?topic=43448.0