Make use of global variables instead of bpf config map

[hzxuzhonghu]

What type of PR is this?

/kind enhancement

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

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PR Overview

This PR implements an enhancement by replacing the use of a BPF config map with global variables for several configuration parameters. The changes involve removing the obsolete km_configmap and associated Kmesh*KmeshConfig structs across multiple files while adding new variable specifications for BpfLogLevel, EnableMonitoring, NodeIp, and PodGateway.

Reviewed Changes

File	Description
bpf/kmesh/bpf2go/dualengine/kmeshsockopsworkload_bpfeb.go	Removed km_configmap references and KmeshSockopsWorkloadKmeshConfig; added variable specs for global configuration.
bpf/kmesh/bpf2go/dualengine/kmeshsockopsworkload_bpfel.go	Removed km_configmap references and KmeshSockopsWorkloadKmeshConfig; added global variables for configuration.
bpf/kmesh/bpf2go/dualengine/kmeshsockopsworkloadcompat_bpfeb.go	Removed km_configmap from maps and KmeshSockopsWorkloadCompatKmeshConfig as part of the config map removal.
bpf/kmesh/bpf2go/dualengine/kmeshsockopsworkloadcompat_bpfel.go	Removed km_configmap and updated variable specs accordingly.
bpf/kmesh/bpf2go/dualengine/kmeshcgroupsockworkloadcompat_bpfeb.go	Removed km_configmap from maps and KmeshCgroupSockWorkloadCompatKmeshConfig.
bpf/kmesh/bpf2go/dualengine/kmeshcgroupsockworkloadcompat_bpfel.go	Removed km_configmap and updated variable specs accordingly.
bpf/kmesh/bpf2go/dualengine/kmeshcgroupsockworkload_bpfeb.go	Removed km_configmap and KmeshCgroupSockWorkloadKmeshConfig in favor of global variables.
bpf/kmesh/bpf2go/dualengine/kmeshcgroupsockworkload_bpfel.go	Removed km_configmap and updated the close logic to match the new configuration style.
bpf/kmesh/bpf2go/dualengine/kmeshxdpauthcompat_bpfeb.go	Removed km_configmap and updated variable specs for authentication configuration.
bpf/kmesh/bpf2go/dualengine/kmeshxdpauth_bpfeb.go	Removed km_configmap from maps and updated variable specs accordingly.
bpf/kmesh/bpf2go/dualengine/kmeshxdpauthcompat_bpfel.go	Removed km_configmap and updated variable specs for consistency.
bpf/kmesh/bpf2go/dualengine/kmeshxdpauth_bpfel.go	Removed km_configmap from maps and updated variable specs accordingly.
bpf/kmesh/bpf2go/dualengine/kmeshsendmsgcompat_bpfeb.go	Removed km_configmap from maps and updated close logic accordingly.
bpf/kmesh/bpf2go/dualengine/kmeshsendmsg_bpfel.go	Removed km_configmap from maps and updated close logic accordingly.
bpf/kmesh/bpf2go/general/kmeshtcmarkdecrypt_bpfel.go	Removed km_configmap from maps and KmeshTcMarkDecryptKmeshConfig in favor of global variables.
bpf/kmesh/bpf2go/general/kmeshtcmarkdecrypt_bpfeb.go	Removed km_configmap from maps and updated configuration accordingly.
bpf/kmesh/bpf2go/dualengine/kmeshsendmsg_bpfeb.go	Removed km_configmap from maps and KmeshSendmsgKmeshConfig in favor of global variables.
bpf/kmesh/bpf2go/dualengine/kmeshsendmsgcompat_bpfel.go	Removed km_configmap from maps and updated close logic accordingly.

Copilot reviewed 44 out of 44 changed files in this pull request and generated no comments.

[hzxuzhonghu]

Let me fix the TestServerAccesslogHandler panic

[YaoZengzeng]

Is it necessary to distinguish between disable and error?

[hzxuzhonghu]

In theory, Variable.Get will not fail.

Whatever, will propagate the error back in a following pr

[YaoZengzeng]

ditto

[codecov]

Codecov Report

Attention: Patch coverage is 40.66667% with 89 lines in your changes missing coverage. Please review.

Project coverage is 44.88%. Comparing base (eeeb399) to head (65bd807).
Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/bpf/bpf.go	40.17%	52 Missing and 15 partials ⚠️
pkg/status/status_server.go	19.04%	16 Missing and 1 partial ⚠️
pkg/controller/controller.go	0.00%	5 Missing ⚠️

❌ Your patch check has failed because the patch coverage (40.66%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Files with missing lines	Coverage Δ
pkg/bpf/ads/loader.go	32.95% <100.00%> (ø)
pkg/bpf/workload/loader.go	25.86% <100.00%> (+2.64%)	⬆️
pkg/utils/test/bpf_map.go	46.55% <ø> (-0.91%)	⬇️
pkg/controller/controller.go	0.00% <0.00%> (ø)
pkg/status/status_server.go	29.73% <19.04%> (+1.37%)	⬆️
pkg/bpf/bpf.go	43.66% <40.17%> (+1.61%)	⬆️

... and 5 files with indirect coverage changes

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[hzxuzhonghu]

@LiZhenCheng9527 @nlgwcy