[client] Improve userspace filter logging performance

[lixmal]

Describe your changes

This improves logging performance when logs are off by eliminating the variadic function call.

Test Case	Variadic	LogN	Improvement
2 Args - Disabled	72.75ns, 32B, 1 alloc	0.85ns, 0B, 0 allocs	86x faster
2 Args - Enabled	102.2ns, 35B, 1 alloc	23.45ns, 0B, 0 allocs	4.4x faster
6 Args - Disabled	112.5ns, 96B, 1 alloc	0.85ns, 0B, 0 allocs	132x faster
6 Args - Enabled	124.9ns, 97B, 1 alloc	38ns, 0B, 0 allocs	3.3x faster

Issue ticket number and link

Stack

Checklist

• Is it a bug fix
• Is a typo/documentation fix
• Is a feature enhancement
• It is a refactor
• Created tests that fail without the change (if possible)
• Extended the README / documentation, if necessary

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[Copilot]

Pull Request Overview

This PR improves logging performance in the userspace filter by replacing variadic logging functions with fixed-argument variants. The changes eliminate the overhead of variadic function calls when logging is disabled, achieving significant performance improvements (80-135x faster for disabled logs, 3-5x faster for enabled logs).

• Replaced variadic logger methods with numbered variants (Error1, Trace2, etc.) for different argument counts
• Updated the logMessage struct to store individual arguments instead of a slice
• Modified all call sites throughout the codebase to use the appropriate numbered logging methods

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
client/firewall/uspfilter/log/log.go	Core logger implementation with new numbered methods and argument handling
client/firewall/uspfilter/log/log_test.go	Updated benchmarks to use new numbered logging methods
client/firewall/uspfilter/nat.go	Updated logging calls to use Error1 and Trace2 methods
client/firewall/uspfilter/forwarder/udp.go	Updated all logging calls to use numbered variants
client/firewall/uspfilter/forwarder/tcp.go	Updated all logging calls to use numbered variants
client/firewall/uspfilter/forwarder/icmp.go	Updated all logging calls to use numbered variants
client/firewall/uspfilter/forwarder/endpoint.go	Updated logging call to use Error1 method
client/firewall/uspfilter/filter.go	Updated all logging calls to use numbered variants
client/firewall/uspfilter/conntrack/udp.go	Updated logging calls to use numbered variants
client/firewall/uspfilter/conntrack/tcp.go	Updated logging calls to use numbered variants
client/firewall/uspfilter/conntrack/icmp.go	Updated logging calls to use numbered variants

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
2 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.9% Duplication on New Code

See analysis details on SonarQube Cloud