fix(yurthub): fix filtermanager state divergence and reset logic for …

[WorrierKhushal]

What type of PR is this?

/kind bug

What this PR does / why we need it:

When the yurt-hub-cfg ConfigMap is updated at runtime, pkg/yurthub/configuration.Manager updates its internal state, but the active FilterManager instance (nameToObjectFilter and resourceSyncers) was never re-initialized or notified of the change.

This mismatch caused a silent state divergence between control-plane configuration and active edge proxy handling, forcing administrators to completely restart YurtHub instances to apply configuration updates.

This PR:

• Introduces an AddListener and notifyListeners mechanism in configuration.Manager so components can register for config-change notifications.
• Implements a safe Reset method on FilterManager protected by a mutex lock, which stops existing resource syncers to prevent goroutine/watch leaks, rebuilds filters, and safely swaps state.
• Wires FilterManager.Reset during YurtHub startup so runtime yurt-hub-cfg reloads automatically and dynamically re-syncs active filters and resource syncers without requiring a process restart.
• Cleans up fake_filtermanager.go and updates tests (manager_test.go) to match the simplified Reset signature.

Fixes #2767

Verified locally with:

go test ./pkg/yurthub/filter/manager/... -v
go test ./pkg/yurthub/configuration/... -v
go vet ./pkg/yurthub/filter/...

[codecov]

Codecov Report

❌ Patch coverage is 54.21687% with 38 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.16%. Comparing base (ddf22f7) to head (5e8f07a).
⚠️ Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/yurthub/util/dumpstack.go	0.00%	20 Missing ⚠️
pkg/yurthub/configuration/manager.go	33.33%	5 Missing and 1 partial ⚠️
pkg/yurthub/filter/manager/manager.go	89.36%	3 Missing and 2 partials ⚠️
...ub/proxy/multiplexer/testing/fake_filtermanager.go	0.00%	4 Missing ⚠️
cmd/yurthub/app/config/config.go	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2768      +/-   ##
==========================================
- Coverage   46.20%   46.16%   -0.04%     
==========================================
  Files         405      405              
  Lines       27540    27628      +88     
==========================================
+ Hits        12724    12755      +31     
- Misses      13649    13698      +49     
- Partials     1167     1175       +8     

Flag	Coverage Δ
unittests	46.16% <54.21%> (-0.04%)	⬇️

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[WorrierKhushal]

Hi maintainers @zyjhtangtang sir ,

I have resolved the filtermanager state divergence issue and cleaned up all the linter checks (including the recent formatting checks). All CI actions and tests are now passing successfully.

Could you please take a look and review this PR when you get a chance?

Thank you!