[JENKINS-76114] Test "All" and "Suggested" buttons from the plugin configuration wizard

[jeromepochat]

This tests that "All" and "Suggested" button from plugin setup wizard are clickable ("None" link is already tested).

Testing done

Manual tests were performed as part of jenkinsci/jenkins#11070.

This extends coverage of the existing automated test. I tested locally:

JENKINS_VERSION=2.526 mvn test -Dtest=InstallWizardTest#wizardInstallCustomPluginsTest

⚠️ This is failing with 2.527 => jenkinsci/jenkins#11070 fixes the issue.

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests that demonstrate the feature works or the issue is fixed

[jtnord]

test would appear to be flaky and performs actions without asserting anything

[jtnord]

FWIW this is a weak test, as junit is a suggested plugin - so the customisation may be completely broken. (there is also no check that the plugin is installed later on!)

[jtnord]

@jeromepochat this fails for some plugins. e.g. workflow-aggregator

can be reproduced with

diff --git a/src/test/java/core/InstallWizardTest.java b/src/test/java/core/InstallWizardTest.java
index 2a8507cb..6d3da103 100644
--- a/src/test/java/core/InstallWizardTest.java
+++ b/src/test/java/core/InstallWizardTest.java
@@ -93,8 +93,8 @@ public class InstallWizardTest extends AbstractJUnitTest {
         wizardCustomize.selectSuggested();
         wizardCustomize.selectAll();
         wizardCustomize.selectNone();
-        wizardCustomize.searchPlugin("JUnit");
-        wizardCustomize.selectPlugin("junit");
+        wizardCustomize.searchPlugin("Pipeline");
+        wizardCustomize.selectPlugin("workflow-aggregator");
         wizardCustomize.startInstall();

         wizardCustomize.shouldFinishInstallSuccessfully();