Update Jenkins plugin docs with native capabilities

[baraka-akeyless]

Summary

• Expand docs/Integrations & Plugins/plugins-overview/jenkins.md to match the current native Akeyless Jenkins plugin.
• Document Freestyle Build Wrapper, Pipeline withAkeyless, JWT/Kubernetes/t-Token auth, dynamic/rotated secrets, PKI/SSH issuers, and optional Synced Credentials.
• Keep the existing UI screenshots and point to the HashiCorp Vault Proxy path for Vault-compatible setups.

Test plan

• Preview the Jenkins page in ReadMe / docs staging and confirm heading hierarchy and callouts render
• Click plugin, repository, auth-method, and HVP links
• Confirm Freestyle screenshots still load
• Spot-check Pipeline snippets against Jenkins Pipeline Syntax (withAkeyless)
• Confirm Synced Credentials tags and withCredentials examples match the plugin README

Made with Cursor

[coderabbitai]

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[EldadH89]

Applying fixes internally