feat: the default metadata key_prefix configuration is empty

[hwjiangkai]

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

[codecov]

Codecov Report

Merging #537 (8aef514) into main (ee76217) will decrease coverage by 1.13%.
The diff coverage is 50.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #537      +/-   ##
==========================================
- Coverage   57.07%   55.94%   -1.13%     
==========================================
  Files         190      191       +1     
  Lines       15191    15495     +304     
==========================================
- Hits         8670     8669       -1     
- Misses       5884     6182     +298     
- Partials      637      644       +7     

Impacted Files	Coverage Δ
internal/controller/eventbus/block/block.go	35.93% <0.00%> (-16.70%)	⬇️
internal/controller/eventbus/block/selector.go	91.66% <ø> (-8.34%)	⬇️
internal/controller/trigger/storage/storage.go	0.00% <ø> (ø)
internal/controller/trigger/worker/policy.go	100.00% <ø> (ø)
internal/gateway/config.go	61.11% <ø> (ø)
internal/gateway/proxy/deadletter.go	0.00% <0.00%> (ø)
internal/primitive/cel/cel.go	68.57% <0.00%> (ø)
...rnal/primitive/interceptor/errinterceptor/error.go	0.00% <0.00%> (ø)
.../primitive/interceptor/memberinterceptor/member.go	0.00% <0.00%> (ø)
internal/primitive/queue/queue.go	87.87% <ø> (ø)
... and 94 more

... and 31 files with indirect coverage changes

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[xdlbdy]

LGTM

[xdlbdy]

do you forget to modify configmap timer in aws-eks.yaml