Fix : spec.EgressIP in egressgateway does not take effect

[lou-lan]

Fix #1404

merge in #1396
this pr will close.

[weizhoublue]

需要 用例 闭环

[lou-lan]

需要 用例 闭环

P00010 P00022

[codecov]

Codecov Report

Attention: Patch coverage is 93.84615% with 4 lines in your changes missing coverage. Please review.

Project coverage is 83.23%. Comparing base (8390880) to head (c39e413).
Report is 3 commits behind head on main.

Files	Patch %	Lines
pkg/controller/tunnel/egress_tunnel.go	75.00%	0 Missing and 2 partials ⚠️
pkg/utils/flat.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1410      +/-   ##
==========================================
- Coverage   85.46%   83.23%   -2.24%     
==========================================
  Files          20       19       -1     
  Lines        2560     2266     -294     
==========================================
- Hits         2188     1886     -302     
- Misses        265      270       +5     
- Partials      107      110       +3     

Flag	Coverage Δ
unittests	83.23% <93.84%> (-2.24%)	⬇️

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

Files	Coverage Δ
pkg/controller/endpoint/cluster_endpoint_slice.go	98.63% <100.00%> (-0.66%)	⬇️
pkg/controller/endpoint/endpoint_slice.go	98.58% <100.00%> (-1.42%)	⬇️
pkg/utils/list.go	100.00% <100.00%> (ø)
pkg/controller/tunnel/egress_tunnel.go	44.20% <75.00%> (+0.53%)	⬆️
pkg/utils/flat.go	92.00% <0.00%> (-8.00%)	⬇️

... and 2 files with indirect coverage changes