fix: validate user config

[tony612]

Signed-off-by: Bing Han h.bing612@gmail.com

Move the cfg.Validate below to validate user config. Without this fix, the test will fail:

--- FAIL: TestValidateUserConfig (0.00s)
    server_test.go:33:
        	Error Trace:	/Users/hanbing/repo/go/envoyproxy-gateway/internal/cmd/server_test.go:33
        	Error:      	An error is expected but got nil.
        	Test:       	TestValidateUserConfig
FAIL
FAIL	github.com/envoyproxy/gateway/internal/cmd	0.601s
FAIL

[codecov-commenter]

Codecov Report

Merging #1028 (4b4eeba) into main (5115330) will increase coverage by 2.89%.
The diff coverage is 80.00%.

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@@            Coverage Diff             @@
##             main    #1028      +/-   ##
==========================================
+ Coverage   62.03%   64.93%   +2.89%     
==========================================
  Files          55       67      +12     
  Lines        8804     8730      -74     
==========================================
+ Hits         5462     5669     +207     
+ Misses       2967     2689     -278     
+ Partials      375      372       -3     

Impacted Files	Coverage Δ
internal/cmd/server.go	17.55% <80.00%> (+10.58%)	⬆️
...ternal/infrastructure/kubernetes/serviceaccount.go	54.83% <0.00%> (-3.79%)	⬇️
internal/ir/xds.go	74.14% <0.00%> (-1.55%)	⬇️
internal/xds/translator/route.go	81.08% <0.00%> (-1.53%)	⬇️
internal/xds/translator/authentication.go	61.99% <0.00%> (-1.28%)	⬇️
internal/xds/translator/ratelimit.go	92.38% <0.00%> (-0.96%)	⬇️
internal/gatewayapi/route.go	85.12% <0.00%> (-0.11%)	⬇️
internal/status/status.go	0.00% <0.00%> (ø)
internal/gatewayapi/listener.go	100.00% <0.00%> (ø)
internal/xds/translator/cluster.go	100.00% <0.00%> (ø)
... and 22 more

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[arkodg]

LGTM, thanks !