feat: add used build plugins and their versions to exec-build span (#5584)

Author: pieh

Diff for: packages/build/src/core/build.ts

@@ -1,4 +1,5 @@
 import { supportedRuntimes } from '@netlify/framework-info'
+import { addAttributesToActiveSpan } from '@netlify/opentelemetry-utils'
 
 import { getErrorInfo } from '../error/info.js'
 import { startErrorMonitor } from '../error/monitor/start.js'
@@ -458,6 +459,17 @@ const initAndRunBuild = async function ({
     systemLog,
   })
 
+  if (pluginsOptionsA?.length) {
+    const buildPlugins = {}
+    for (const plugin of pluginsOptionsA) {
+      if (plugin?.pluginPackageJson?.name) {
+        buildPlugins[`build.plugins['${plugin.pluginPackageJson.name}']`] = plugin?.pluginPackageJson?.version ?? 'N/A'
+      }
+    }
+
+    addAttributesToActiveSpan(buildPlugins)
+  }
+
   errorParams.pluginsOptions = pluginsOptionsA
 
   const { childProcesses, timers: timersB } = await startPlugins({