Add Gcore CDN to taxonomy

[AlteredCoder]

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crowdsecurity/crs-exclusion-plugin-cpanel:

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[Copilot]

Pull request overview

Adds a new false-positive taxonomy entry for Gcore CDN exit IPs so they can be labeled and handled consistently alongside other CDN exit-node exemptions.

Changes:

• Add cdn:gcore_exit_node entry to the false positives taxonomy with description/label/name.

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