fix #4139: preserve node pod counting when jumping to node view

[thinkniko]

Set KeyPodCounting in the browser default context for nodes so navigation still counts pods after context callbacks are overridden.

[mpas97]

@uozalp We previously fixed jumps to only fallback to default browser if target is an unknown gvr #4066. Now this sounds similiar and default context should not be used for known gvr (this would also mean we have to fix context for all other gvr). I think the observed behaviour is coming from the fact that we redefine the parent context function in custom_jumps.go. Therefore our inherited KeyPodCounting variable is lost there. Commenting out the following lines, makes pod count working again too:

// Set up the context for the jump
v.SetContextFn(func(ctx context.Context) context.Context {
	if fieldSel != "" {
		ctx = context.WithValue(ctx, internal.KeyFields, fieldSel)
	}
	return ctx
})

[thinkniko]

Which would be the better change for fixing #4139 ?