Remove unused IAMPermissions global variable (#2831)

The IAMPermissions global map was being populated but never read or
used. IAM permissions are already properly tracked through:
- The IAMPermissions field in AdapterMeta struct (for dynamic adapters)
- The IAMPermissions() method interface (for manual adapters)

Changes:
- Deleted sources/gcp/shared/iam-permissions.go
- Removed code that populated the global map in adapters.go
- Removed 4 occurrences of population code in transformer.go

The code compiles and all tests pass after these changes.

GitOrigin-RevId: a327618997c6bcf7c1601bd2b8ba05d7c5fc83c0

Author: omerdemirok

sources/gcp/dynamic/adapters.go

@@ -141,11 +141,6 @@ func MakeAdapter(sdpItemType shared.ItemType, linker *gcpshared.Linker, httpCli
 		ListResponseSelector: meta.ListResponseSelector,
 	}
 
-	// Add IAM permissions to the global map
-	for _, perm := range meta.IAMPermissions {
-		gcpshared.IAMPermissions[perm] = true
-	}
-
 	switch adapterType(meta) {
 	case SearchableListable:
 		searchEndpointFunc, err := meta.SearchEndpointFunc(opts...)

sources/gcp/shared/iam-permissions.go

@@ -130,12 +130,6 @@ func WrapperToAdapter(wrapper Wrapper) StandardAdapter {
 				panic(fmt.Sprintf("failed to validate adapter: %v", err))
 			}
 
-			if iamPerms := wrapper.IAMPermissions(); len(iamPerms) > 0 {
-				for _, perm := range iamPerms {
-					gcpshared.IAMPermissions[perm] = true
-				}
-			}
-
 			return a
 		}
 
@@ -153,12 +147,6 @@ func WrapperToAdapter(wrapper Wrapper) StandardAdapter {
 			panic(fmt.Sprintf("failed to validate adapter: %v", err))
 		}
 
-		if iamPerms := wrapper.IAMPermissions(); len(iamPerms) > 0 {
-			for _, perm := range iamPerms {
-				gcpshared.IAMPermissions[perm] = true
-			}
-		}
-
 		return a
 	}
 
@@ -177,12 +165,6 @@ func WrapperToAdapter(wrapper Wrapper) StandardAdapter {
 			panic(fmt.Sprintf("failed to validate adapter: %v", err))
 		}
 
-		if iamPerms := wrapper.IAMPermissions(); len(iamPerms) > 0 {
-			for _, perm := range iamPerms {
-				gcpshared.IAMPermissions[perm] = true
-			}
-		}
-
 		return a
 	}
 
@@ -195,12 +177,6 @@ func WrapperToAdapter(wrapper Wrapper) StandardAdapter {
 		panic(fmt.Sprintf("failed to validate adapter: %v", err))
 	}
 
-	if iamPerms := wrapper.IAMPermissions(); len(iamPerms) > 0 {
-		for _, perm := range iamPerms {
-			gcpshared.IAMPermissions[perm] = true
-		}
-	}
-
 	return a
 }