fix(snmp): satisfy lint checks in resilience code

[kongfei605]

No description provided.

[Copilot]

Pull request overview

This PR updates the SNMP input’s resilience/health-check and filter parsing code to satisfy lint checks, primarily by removing unused helpers and addressing “replace with -1” / unchecked-return patterns.

Changes:

• Replaced strings.Replace(..., -1) with strings.ReplaceAll in SNMP table filter parsing.
• Updated the recovery probe to defer-close the SNMP wrapper while explicitly ignoring the close error (to satisfy errcheck-style linters).
• Removed unused helper methods in SNMP table/runtime/dependency cache code.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
inputs/snmp/table.go	Uses strings.ReplaceAll in filter parsing and removes an unused filter-dependency helper.
inputs/snmp/runtime.go	Removes an unused recordSuccess() wrapper (callers use the locked variant).
inputs/snmp/health_check.go	Wraps defer gs.Close() to explicitly ignore the returned error.
inputs/snmp/dependency_cache.go	Removes an unused clear() method wrapper (nil-check + lock + clearLocked).

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.