Add support for standard kubectl tracing

[skissane-medallia]

What does this PR change?

Add support for enabling K8S API client library tracing

Does this PR rely on any other PRs?

No

How does this PR impact users? (This is the kind of thing that goes in release notes!)

I am having a problem with the portforwarding into the pod. Standard approach for debugging these kinds of issues is to pass -v=9 argument to kubectl so I see the actual API traffic dumps in the logs. But kubectl cost didn't support that argument, so there was no way to turn the K8S API client library tracing on.

Links to Issues or ZD tickets this PR addresses or fixes

None

How was this PR tested?

kubectl cost namespace -v=9 shows K8S API traffic, for example:

I0914 09:10:41.594867   79299 loader.go:402] Config loaded from file:  /Users/skissane/.kube/example-kubeconfig
I0914 09:10:41.596519   79299 envvar.go:172] "Feature gate default state" feature="ClientsPreferCBOR" enabled=false
I0914 09:10:41.596537   79299 envvar.go:172] "Feature gate default state" feature="InformerResourceVersion" enabled=false
I0914 09:10:41.596552   79299 envvar.go:172] "Feature gate default state" feature="WatchListClient" enabled=false
I0914 09:10:41.596562   79299 envvar.go:172] "Feature gate default state" feature="ClientsAllowCBOR" enabled=false
I0914 09:10:41.598641   79299 type.go:168] "Request Body" body=""
I0914 09:10:41.599672   79299 round_trippers.go:473] curl -v -XGET  -H "Accept: application/vnd.kubernetes.protobuf,application/json" -H "User-Agent: kubectl-cost/v0.0.0 (darwin/arm64) kubernetes/$Format" -H "Authorization: Bearer <masked>" 'https://kubernetes.dc.example.com/api/v1/namespaces/kubecost/services/kubecost-cost-analyzer'
I0914 09:10:41.604339   79299 round_trippers.go:502] HTTP Trace: DNS Lookup for kubernetes.dc.example.com resolved to [{10.234.156.178 }]
I0914 09:10:41.774487   79299 round_trippers.go:517] HTTP Trace: Dial to tcp:10.234.156.178:443 succeed
I0914 09:10:42.135729   79299 round_trippers.go:560] GET https://kubernetes.dc.example.com/api/v1/namespaces/kubecost/services/kubecost-cost-analyzer 401 Unauthorized in 535 milliseconds
I0914 09:10:42.136002   79299 round_trippers.go:577] HTTP Statistics: DNSLookup 2 ms Dial 170 ms TLSHandshake 188 ms ServerProcessing 170 ms Duration 535 ms
I0914 09:10:42.136047   79299 round_trippers.go:584] Response Headers:
I0914 09:10:42.136099   79299 round_trippers.go:587]     Audit-Id: 698c4097-ede4-48d2-961f-f199085a6d66
I0914 09:10:42.136131   79299 round_trippers.go:587]     Cache-Control: no-cache, private
I0914 09:10:42.136160   79299 round_trippers.go:587]     Content-Type: application/vnd.kubernetes.protobuf
I0914 09:10:42.136194   79299 round_trippers.go:587]     Date: Sat, 13 Sep 2025 23:10:42 GMT
I0914 09:10:42.136224   79299 round_trippers.go:587]     Content-Length: 72
I0914 09:10:42.136256   79299 round_trippers.go:587]     Strict-Transport-Security: max-age=31536000; includeSubDomains
I0914 09:10:42.136471   79299 type.go:168] "Response Body" body=<
	00000000  6b 38 73 00 0a 0c 0a 02  76 31 12 06 53 74 61 74  |k8s.....v1..Stat|
	00000010  75 73 12 30 0a 06 0a 00  12 00 1a 00 12 07 46 61  |us.0..........Fa|
	00000020  69 6c 75 72 65 1a 0c 55  6e 61 75 74 68 6f 72 69  |ilure..Unauthori|
	00000030  7a 65 64 22 0c 55 6e 61  75 74 68 6f 72 69 7a 65  |zed".Unauthorize|
	00000040  64 30 91 03 1a 00 22 00                           |d0....".|
 >

Have you made an update to documentation?

No