[DOCS] Remove testenv annotations from doc snippet tests (#80023) (#80458)

Removes `testenv` annotations and related code. These annotations originally let you skip x-pack snippet tests in the docs. However, that's no longer possible.

Relates to #79309, #31619
# Conflicts:
#	docs/reference/ml/df-analytics/apis/get-trained-model-deployment-stats.asciidoc
#	docs/reference/ml/df-analytics/apis/infer-trained-model-deployment.asciidoc
#	docs/reference/ml/df-analytics/apis/put-trained-model-definition-part.asciidoc
#	docs/reference/ml/df-analytics/apis/put-trained-model-vocabulary.asciidoc
#	docs/reference/ml/df-analytics/apis/start-trained-model-deployment.asciidoc
#	docs/reference/ml/df-analytics/apis/stop-trained-model-deployment.asciidoc
#	docs/reference/slm/apis/slm-delete.asciidoc
#	docs/reference/slm/apis/slm-execute-retention.asciidoc
#	docs/reference/slm/apis/slm-execute.asciidoc
#	docs/reference/slm/apis/slm-get-status.asciidoc
#	docs/reference/slm/apis/slm-get.asciidoc
#	docs/reference/slm/apis/slm-start.asciidoc
#	docs/reference/slm/apis/slm-stats.asciidoc
#	docs/reference/slm/apis/slm-stop.asciidoc
#	docs/reference/sql/endpoints/client-apps/tableau-desktop.asciidoc
#	docs/reference/sql/endpoints/client-apps/tableau-server.asciidoc

Author: jrodewig

build-tools-internal/src/main/groovy/org/elasticsearch/gradle/internal/doc/RestTestsFromSnippetsTask.groovy

@@ -257,19 +257,6 @@ class RestTestsFromSnippetsTask extends SnippetsTask {
                 current.println("        - stash_in_path")
                 current.println("        - stash_path_replace")
                 current.println("        - warnings")
-                if (test.testEnv != null) {
-                    switch (test.testEnv) {
-                    case 'basic':
-                    case 'gold':
-                    case 'platinum':
-                    case 'enterprise':
-                        current.println("        - xpack")
-                        break;
-                    default:
-                        throw new InvalidUserDataException('Unsupported testEnv: '
-                                + test.testEnv)
-                    }
-                }
             }
             if (test.skip) {
                 if (test.continued) {

build-tools-internal/src/main/groovy/org/elasticsearch/gradle/internal/doc/SnippetsTask.groovy

@@ -73,7 +73,6 @@ class SnippetsTask extends DefaultTask {
             Snippet snippet = null
             StringBuilder contents = null
             List substitutions = null
-            String testEnv = null
             Closure emit = {
                 snippet.contents = contents.toString()
                 contents = null
@@ -140,14 +139,10 @@ class SnippetsTask extends DefaultTask {
             }
             file.eachLine('UTF-8') { String line, int lineNumber ->
                 Matcher matcher
-                matcher = line =~ /\[testenv="([^"]+)"\]\s*/
-                if (matcher.matches()) {
-                    testEnv = matcher.group(1)
-                }
                 if (line ==~ /-{4,}\s*/) { // Four dashes looks like a snippet
                     if (snippet == null) {
                         Path path = docs.dir.toPath().relativize(file.toPath())
-                        snippet = new Snippet(path: path, start: lineNumber, testEnv: testEnv, name: name)
+                        snippet = new Snippet(path: path, start: lineNumber, name: name)
                         if (lastLanguageLine == lineNumber - 1) {
                             snippet.language = lastLanguage
                         }
@@ -333,7 +328,6 @@ class SnippetsTask extends DefaultTask {
         int start
         int end = NOT_FINISHED
         String contents
-        String testEnv
 
         Boolean console = null
         boolean test = false
@@ -362,9 +356,6 @@ class SnippetsTask extends DefaultTask {
             }
             if (test) {
                 result += '// TEST'
-                if (testEnv != null) {
-                    result += "[testenv=$testEnv]"
-                }
                 if (catchPart) {
                     result += "[catch: $catchPart]"
                 }