fix(pkg/oci): fix Tags pagination support.

[FedeDP]

What type of PR is this?

/kind bug

Any specific area of the project related to this PR?

/area library

What this PR does / why we need it:

When tags are paginated, we need to continuously append to our resulting slice instead of overwriting it.
Example output before:

./falcoctl artifact info cloudtrail-rules --config=config.yaml 
REF                                             	TAGS
ghcr.io/falcosecurity/plugins/ruleset/cloudtrail	

Example output after:

./falcoctl artifact info cloudtrail-rules --config=config.yaml 
REF                                             	TAGS
ghcr.io/falcosecurity/plugins/ruleset/cloudtrail	latest, 0, 0.7, 0.7.0, 0.7.1, 0.7.2, 0.7.3, 0.8, 0.8.0, 0.9, 0.9.0, 0.9.1, 0.10, 0.10.0, 0.11, 0.11.0, main, 0.12, 0.12.0, 0.12.1, 0.12.2, 0.12.3

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

This is also affecting whole Falco CI: https://github.com/falcosecurity/falco/actions/runs/11932413814?pr=3407

/cc @alacuku

I propose to put this one in a patch release for falcoctl and package it with Falco 0.39.2.
cc @leogr

[alacuku]

Nice catch!

[alacuku]

/lgtm

[poiana]

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