feat: enhanced subnet discovery rebase from #3380 (#3463)

* pkg awsutils

* pkg ec2wrapper: add func to describe subnets

* pkg ipamd: handle primary ENI exclusion

* test: add integration test

* pkg: enable subnet discovery for IPv6 mode

* test integration eni-subnet-discovery: extend tests for IPv6 mode

* pkg: use shared context for awsutils and ipamd

* pkg awsutils: fix compilation error

* pkg ipamd: clean up ENI if not previously used

* pkg ipamd: gracefully exclude primary ENI if existing pods

* test integration: add integration test for primary ENI exclusion

* pkg ipamd: fix bug when calculating currentENIs when primary ENI is excluded

* pkg ipamd: implement secondary ENI exclusion logic

* pkg ipamd: add unit test for secondary ENI exclusion

* test integration: add integ test for secondary ENI exclusion testing

* test integration: add test for security group refresh

* rebase to latest mainline chnages

* remove value check for tags

* reviewed

* updated based on comments

* add more unit tests

* primary ENI can't be easily ignored

---------

Co-authored-by: Shehbaj Dhillon <dshehbaj@amazon.com>

Author: haouc

cmd/aws-k8s-agent/main.go

@@ -144,7 +144,8 @@ func _main() int {
 	}
 	// Measure node initialization duration
 	IPAMDNodeInitStartTime := time.Now()
-	ipamContext, err := ipamd.New(k8sClient, withApiServer)
+	ctx := context.Background()
+	ipamContext, err := ipamd.New(ctx, k8sClient, withApiServer)
 	IPAMDNodeInitDuration := time.Since(IPAMDNodeInitStartTime).Seconds()
 
 	if err != nil {
@@ -164,7 +165,7 @@ func _main() int {
 	}
 
 	// Pool manager
-	go ipamContext.StartNodeIPPoolManager()
+	go ipamContext.StartNodeIPPoolManager(ctx)
 
 	if !utils.GetBoolAsStringEnvVar(envDisableMetrics, false) {
 		// Prometheus metrics