fix: create new docker network only when the --docker-network flag is not set

[renzodavid9]

Description
Change behaviour so we don't create a new docker network when skaffold verify is run with the --docker-network flag, instead we assume the docker network with the given name already exists.

[codecov]

Codecov Report

Merging #8649 (078c179) into main (290280e) will decrease coverage by 6.37%.
The diff coverage is 54.47%.

@@            Coverage Diff             @@
##             main    #8649      +/-   ##
==========================================
- Coverage   70.48%   64.12%   -6.37%     
==========================================
  Files         515      615     +100     
  Lines       23150    30817    +7667     
==========================================
+ Hits        16317    19761    +3444     
- Misses       5776     9572    +3796     
- Partials     1057     1484     +427     

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/completion.go	13.04% <0.00%> (-1.25%)	⬇️
cmd/skaffold/app/cmd/config/list.go	65.21% <ø> (ø)
cmd/skaffold/app/cmd/config/set.go	88.72% <ø> (ø)
cmd/skaffold/app/cmd/config/util.go	54.28% <ø> (ø)
cmd/skaffold/app/cmd/credits.go	100.00% <ø> (ø)
cmd/skaffold/app/cmd/credits/export.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/deploy.go	40.90% <0.00%> (-12.94%)	⬇️
cmd/skaffold/app/cmd/generate_pipeline.go	60.00% <ø> (ø)
cmd/skaffold/app/cmd/inspect_modules.go	65.00% <ø> (ø)
cmd/skaffold/app/cmd/inspect_profiles.go	66.66% <ø> (ø)
... and 39 more

... and 395 files with indirect coverage changes

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[aaron-prindle]

Can you also update the flag help description here to indicate that this docker-network will not be created and what happens by default

https://github.com/GoogleContainerTools/skaffold/blob/main/cmd/skaffold/app/cmd/flags.go#L678

[renzodavid9]

Can you also update the flag help description here to indicate that this docker-network will not be created and what happens by default

https://github.com/GoogleContainerTools/skaffold/blob/main/cmd/skaffold/app/cmd/flags.go#L678

Done! I changed the flag description.

[aaron-prindle]

LGTM!