fix: can not reclaim eventbus name

[xdlbdy]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

[xdlbdy]

clean eventbusNamespaceMapping for delete eventbus

[codecov]

Codecov Report

Merging #612 (bdd7d35) into main (ee76217) will decrease coverage by 3.06%.
Report is 81 commits behind head on main.
The diff coverage is 47.52%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #612      +/-   ##
==========================================
- Coverage   57.07%   54.01%   -3.06%     
==========================================
  Files         190      224      +34     
  Lines       15191    18082    +2891     
==========================================
+ Hits         8670     9767    +1097     
- Misses       5884     7521    +1637     
- Partials      637      794     +157     

Files Changed	Coverage Δ
internal/controller/trigger/storage/storage.go	0.00% <ø> (ø)
...rnal/controller/trigger/validation/subscription.go	62.64% <ø> (ø)
internal/controller/trigger/worker/manager.go	85.76% <ø> (+0.83%)	⬆️
internal/controller/trigger/worker/policy.go	100.00% <ø> (ø)
internal/controller/trigger/worker/scheduler.go	71.01% <ø> (+1.01%)	⬆️
internal/controller/trigger/worker/worker.go	78.45% <ø> (-1.55%)	⬇️
internal/gateway/config.go	60.60% <ø> (-0.51%)	⬇️
internal/gateway/gateway.go	57.64% <ø> (-10.03%)	⬇️
internal/gateway/proxy/auth.go	0.00% <ø> (ø)
internal/gateway/proxy/deadletter.go	0.00% <ø> (ø)
... and 68 more

... and 67 files with indirect coverage changes

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