chore: delete default metadata in webhook

[Rory-Z]

No description provided.

[codecov]

Codecov Report

Patch coverage: 97.24% and project coverage change: -0.09% ⚠️

Comparison is base (4048aea) 77.34% compared to head (694e614) 77.26%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #924      +/-   ##
==========================================
- Coverage   77.34%   77.26%   -0.09%     
==========================================
  Files          67       67              
  Lines        6035     6038       +3     
==========================================
- Hits         4668     4665       -3     
- Misses       1141     1147       +6     
  Partials      226      226              

Files Changed	Coverage Δ
apis/apps/v2beta1/emqx_webhook.go	92.85% <ø> (-3.64%)	⬇️
apis/apps/v2beta1/util.go	70.03% <89.65%> (-1.40%)	⬇️
apis/apps/v2beta1/names.go	100.00% <100.00%> (ø)
controllers/apps/v2beta1/add_bootstrap_resource.go	89.47% <100.00%> (ø)
controllers/apps/v2beta1/add_emqx_core.go	90.66% <100.00%> (+0.15%)	⬆️
controllers/apps/v2beta1/add_emqx_repl.go	89.92% <100.00%> (+0.18%)	⬆️
controllers/apps/v2beta1/add_svc.go	76.86% <100.00%> (+1.86%)	⬆️
controllers/apps/v2beta1/emqx_controller.go	89.92% <100.00%> (+1.55%)	⬆️
controllers/apps/v2beta1/sync_emqx_config.go	63.54% <100.00%> (+6.25%)	⬆️
controllers/apps/v2beta1/update_emqx_status.go	77.48% <100.00%> (ø)
... and 2 more

... and 5 files with indirect coverage changes

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