fix: filter useless pod update event

[nayihz]

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches

What this PR does / why we need it:

onUpdate will get pod update event every resync_interval seconds/hours. It's unnecessary.

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[codecov-commenter]

Codecov Report

Merging #894 (bdef0c9) into master (77383b8) will increase coverage by 0.01%.
The diff coverage is 22.35%.

@@            Coverage Diff             @@
##           master     #894      +/-   ##
==========================================
+ Coverage   32.05%   32.06%   +0.01%     
==========================================
  Files          70       70              
  Lines        7740     7755      +15     
==========================================
+ Hits         2481     2487       +6     
- Misses       4984     4993       +9     
  Partials      275      275              

Impacted Files	Coverage Δ
pkg/ingress/apisix_consumer.go	0.00% <0.00%> (ø)
pkg/ingress/apisix_pluginconfig.go	0.00% <0.00%> (ø)
pkg/ingress/apisix_route.go	0.00% <0.00%> (ø)
pkg/ingress/apisix_tls.go	0.00% <0.00%> (ø)
pkg/ingress/apisix_upstream.go	0.00% <0.00%> (ø)
pkg/ingress/compare.go	0.00% <0.00%> (ø)
pkg/ingress/endpoint.go	0.00% <0.00%> (ø)
pkg/ingress/endpointslice.go	0.00% <0.00%> (ø)
pkg/ingress/gateway.go	0.00% <0.00%> (ø)
pkg/ingress/ingress.go	6.76% <0.00%> (ø)
... and 5 more

---

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[tao12345666333]

Flaky test #869

[gxthrj]

The logic is OK.

[lingsamuel]

@gxthrj It seems that what you submitted is not an approval, but just a comment.

[tao12345666333]

LGTM

re-run CI test.

[nayihz]

The e2e-test failed. Similar error as before. Nothing to with this pr. @tao12345666333

[tao12345666333]

Yep. Flaky test #869
This issue has not yet been reproduced locally. re-run 😿

[tao12345666333]

It's green