Extend [Nexus] fallback logic to cover repository version badge (#4662)

Co-authored-by: repo-ranger[bot] <39074581+repo-ranger[bot]@users.noreply.github.com>

services/nexus/nexus.service.js

@@ -187,11 +187,12 @@ module.exports = class Nexus extends BaseJsonService {
       return this.fetch3({ server, repo, groupId, artifactId, queryOpt })
     }
     // Most servers still use Nexus 2. Fall back to Nexus 3 if the hitting a
-    // Nexus 2 endpoint returns a Bad Request (=> InvalidResponse).
+    // Nexus 2 endpoint returns a Bad Request (=> InvalidResponse, for path /service/local/artifact/maven/resolve)
+    // or a Not Found (for path /service/local/artifact/maven/resolve).
     try {
       return await this.fetch2({ server, repo, groupId, artifactId, queryOpt })
     } catch (e) {
-      if (e instanceof InvalidResponse) {
+      if (e instanceof InvalidResponse || e instanceof NotFound) {
         return this.fetch3({ server, repo, groupId, artifactId, queryOpt })
       }
       throw e

services/nexus/nexus.tester.js

@@ -271,6 +271,18 @@ t.create('Nexus 3 - repository version')
     message: isVersion,
   })
 
+t.create(
+  'Nexus 3 - repository version valid artifact without explicit nexusVersion parameter'
+)
+  .timeout(15000)
+  .get(
+    '/proxy-public-3rd-party-release/com.fasterxml.jackson.core/jackson-databind.json?server=https://nexus.pentaho.org'
+  )
+  .expectBadge({
+    label: 'nexus',
+    message: isVersion,
+  })
+
 t.create('Nexus 3 - repository version with query')
   .get(
     `/proxy-public-3rd-party-release/org.junit.jupiter/junit-jupiter.json?server=https://nexus.pentaho.org&nexusVersion=3&queryOpt=${encodeURIComponent(