[Improve][Manager] Fix the security vulnerability in /api/cluster/testConnection

[fuweng11]

Description

Currently, /api/cluster/testConnection does not perform role verification or SSRF verification. To fix this issue, it is necessary to add relevant verifications to this API.

Fix the security vulnerability in /api/cluster/testConnection.

1. Add @RequiresRoles to testConnection consistent with other data node
   management operations.
2. Extend UrlVerificationUtils to deny link-local, loopback, and RFC 1918
   address ranges.
3. Configure RestTemplate instances used by HTTP-based operators to reject
   SSRF-prone targets before connecting.

InLong Component

InLong Manager

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• Yes, I am willing to submit a PR!

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