fix the version subcommand panic

[mladen-rusev-cyberark]

The error message panic: unable to redefine 'v' shorthand in "version" flagset: it's already used for "verbose" flag clearly indicates that the shorthand -v was being defined for two different flags.

logs.AddFlags() function also defined a flag with the shorthand -v caused the conflict.

Using .BoolVar() instead of .BoolVarP() to define the verbose flag solves the problem.

Testing:

$ docker load < /home/mladen/IdeaProjects/jetstack-secure/_bin/scratch/image/oci-layout-ark.docker.tar
...
Loaded image: jetstack.local/disco-agent:v1.7.0-alpha.5-5-g37ae1dbc56bb50-dirty
$ docker images jetstack.local/disco-agent
REPOSITORY                   TAG                                      IMAGE ID       CREATED          SIZE
jetstack.local/disco-agent   v1.7.0-alpha.5-5-g37ae1dbc56bb50-dirty   1e87c0ca47e6   13 minutes ago   42.3MB
$ docker run --rm jetstack.local/disco-agent:v1.7.0-alpha.5-5-g37ae1dbc56bb50-dirty version
Preflight version:  v1.7.0-alpha.5-5-g37ae1dbc56bb50-dirty linux/amd64
$ docker run --rm jetstack.local/disco-agent:v1.7.0-alpha.5-5-g37ae1dbc56bb50-dirty version --verbose
Preflight version:  v1.7.0-alpha.5-5-g37ae1dbc56bb50-dirty linux/amd64
  Commit:  37ae1dbc56bb50ec667eeea8c6b2b8787c43e070
  Built:   2025-10-23-13:54:05-EEST
  Go:      go1.24.5