Fix validation for _global APIs (#4659) (#4660)

The existing namespace computation was too naive.

(cherry picked from commit bd228bb)

Co-authored-by: Quentin Pradet <[email protected]>

Author: github-actions[bot]

.github/validate-pr/index.js

@@ -105,7 +105,7 @@ async function run() {
           ci: false,
           verbose: false
         })
-        const [namespace, _method] = api.split('.')
+        const namespace = getNamespace(api)
         // Asked to validate a specific API, so we only store that one
         reports.set(api, report.get(namespace)[0])
       }
@@ -120,7 +120,7 @@ async function run() {
         verbose: false
       })
 
-      const [namespace, _method] = api.split('.')
+      const namespace = getNamespace(api)
       // Asked to validate a specific API, so we only store that one
       reports.set(api, report.get(namespace)[0])
     }
@@ -162,7 +162,6 @@ function getApi (file) {
   return file.split('/').slice(1, 3).filter(s => !privateNames.includes(s)).filter(Boolean).join('.')
 }
 
-
 function findBaselineReport(apiName, baselineValidation) {
   const [namespace, method] = apiName.split('.')