Integration test improvements (#2109)

* Improvements to integrations

Borrowed largely from https://github.com/elastic/elasticsearch-serverless-js/pull/38

* Bump all the things to 8.12.0

* Split Dockerfile copy into two layers

* Fix test cron names

test/integration/index.js

@@ -317,7 +317,7 @@ async function start ({ client, isXPack }) {
         if (name === 'setup' || name === 'teardown') continue
         if (options.test && !name.endsWith(options.test)) continue
 
-        const junitTestCase = junitTestSuite.testcase(name, `node_${process.version}/${cleanPath}`)
+        const junitTestCase = junitTestSuite.testcase(name, `node_${process.version}: ${cleanPath}`)
 
         stats.total += 1
         if (shouldSkip(isXPack, file, name)) {
@@ -336,6 +336,7 @@ async function start ({ client, isXPack }) {
           junitTestSuite.end()
           junitTestSuites.end()
           generateJunitXmlReport(junit, isXPack ? 'platinum' : 'free')
+          err.meta = JSON.stringify(err.meta ?? {}, null, 2)
           console.error(err)
 
           if (options.bail) {
@@ -374,6 +375,7 @@ async function start ({ client, isXPack }) {
   - Total: ${stats.total}
   - Skip: ${stats.skip}
   - Pass: ${stats.pass}
+  - Fail: ${stats.total - (stats.pass + stats.skip)}
   - Assertions: ${stats.assertions}
   `)
 }