Fix: The addon page displays the deleted addon

[suwliang3]

Description of your changes

After you delete an addon from the addon repository, the addon management page shouldn't display the addon.

Fixes #5750

I have:

• Read and followed KubeVela's contribution process.
• Related Docs updated properly. In a new feature or configuration option, an update to the documentation is necessary.
• Run make reviewable to ensure this PR is ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

How has this code been tested

Special notes for your reviewer

[codecov]

Codecov Report

Patch coverage: 72.72% and project coverage change: -4.81 ⚠️

Comparison is base (9def408) 60.65% compared to head (4c0a2d7) 55.85%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5924      +/-   ##
==========================================
- Coverage   60.65%   55.85%   -4.81%     
==========================================
  Files         224      184      -40     
  Lines       31162    27819    -3343     
==========================================
- Hits        18900    15537    -3363     
- Misses      10488    10722     +234     
+ Partials     1774     1560     -214     

Flag	Coverage Δ
core-unittests	55.85% <72.72%> (+0.01%)	⬆️
e2e-multicluster-test	?
e2etests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/addon/cache.go	35.44% <72.72%> (+1.81%)	⬆️

... and 120 files with indirect coverage changes

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[suwliang3]

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