use ADS cache to ensure the rule order

[zetaab]

What type of PR is this?
fix: modifies gateway to use ADS mode

What this PR does / why we need it:

This pr will ensure that the delta watches are sent in correct order (see https://github.com/envoyproxy/go-control-plane/blob/main/pkg/cache/v3/simple.go#L301-L304)

Which issue(s) this PR fixes:

Fixes #2521

Like mentioned in issue, after this modification everything works great! and I can run my go script to verify it:

% go run main.go 
httproute.gateway.networking.k8s.io/echoserver-ext configured
2024/02/16 23:41:06 fetching code
securitypolicy.gateway.envoyproxy.io/echoserver-ext-oidc created
2024/02/16 23:41:06 fetching code
2024/02/16 23:41:07 fetching code
securitypolicy.gateway.envoyproxy.io "echoserver-ext-oidc" deleted
httproute.gateway.networking.k8s.io "echoserver-ext" deleted
httproute.gateway.networking.k8s.io/echoserver-ext created
2024/02/16 23:41:10 fetching code
2024/02/16 23:41:11 fetching code
securitypolicy.gateway.envoyproxy.io/echoserver-ext-oidc created
2024/02/16 23:41:11 fetching code
2024/02/16 23:41:12 fetching code
securitypolicy.gateway.envoyproxy.io "echoserver-ext-oidc" deleted
httproute.gateway.networking.k8s.io "echoserver-ext" deleted
First failure count: 0
Second failure count: 0
Total executions: 2

[arkodg]

wow, thank you for finding and fixing this !

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (cc88e9c) 63.54% compared to head (28c1149) 63.49%.

Files	Patch %	Lines
internal/xds/server/runner/runner.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2634      +/-   ##
==========================================
- Coverage   63.54%   63.49%   -0.06%     
==========================================
  Files         119      119              
  Lines       19236    19236              
==========================================
- Hits        12223    12213      -10     
- Misses       6198     6207       +9     
- Partials      815      816       +1     

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[shawnh2]

lgtm thanks