Remove jQuery from 'New item' page

[janfaracik]

This PR removes jQuery from the 'New item' page. Removing jQuery simplifies the codebase by relying on modern JavaScript features, which are now supported across all major browsers without the need for jQuery. It's also a reduction in dependencies/JS size, which will make for a faster experience for users.

Testing done

• New item page works as expected
• Blank check works
• Existing name check works
• Illegal name works
• Selecting a type of item and then duplicating a project removes the selection
• Duplicating a project then selecting a type of item removes the duplicated project text

Proposed changelog entries

• N/A

Proposed upgrade guidelines

N/A

Submitter checklist

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1. The Jira issue, if it exists, is well-described.
2. The changelog entries and upgrade guidelines are appropriate for the audience affected by the change (users or developers, depending on the change) and are in the imperative mood (see examples). Fill in the Proposed upgrade guidelines section only if there are breaking changes or changes that may require extra steps from users during upgrade.
3. There is automated testing or an explanation as to why this change has no tests.
4. New public classes, fields, and methods are annotated with @Restricted or have @since TODO Javadocs, as appropriate.
5. New deprecations are annotated with @Deprecated(since = "TODO") or @Deprecated(forRemoval = true, since = "TODO"), if applicable.
6. New or substantially changed JavaScript is not defined inline and does not call eval to ease future introduction of Content Security Policy (CSP) directives (see documentation).
7. For dependency updates, there are links to external changelogs and, if possible, full differentials.
8. For new APIs and extension points, there is a link to at least one consumer.

Desired reviewers

@jenkinsci/sig-ux

Before the changes are marked as ready-for-merge:

Maintainer checklist

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1. There are at least two (2) approvals for the pull request and no outstanding requests for change.
2. Conversations in the pull request are over, or it is explicit that a reviewer is not blocking the change.
3. Changelog entries in the pull request title and/or Proposed changelog entries are accurate, human-readable, and in the imperative mood.
4. Proper changelog labels are set so that the changelog can be generated automatically.
5. If the change needs additional upgrade steps from users, the upgrade-guide-needed label is set and there is a Proposed upgrade guidelines section in the pull request title (see example).
6. If it would make sense to backport the change to LTS, a Jira issue must exist, be a Bug or Improvement, and be labeled as lts-candidate to be considered (see query).

[janfaracik]

Now prevents names that are just spaces from being submitted.

[janfaracik]

Rather than accept a true/false parameter lets just have the function handle whether the button should be valid or not.

[krisstern]

It looks like some JUnit tests are now failing after the removal of JQuery from the "New item" page:

00:47:53  [ERROR] Errors: 
00:47:53  [ERROR]   MyViewTest.testDoCreateItem:93 » Script TypeError: Cannot set property "value" of null to "" (http://localhost:34599/jenkins/static/44ddddd0/jsbundles/add-item.js#96)
00:47:53  [INFO] 
00:47:53  [ERROR] Tests run: 2214, Failures: 0, Errors: 1, Skipped: 55
00:47:53  [INFO] 
00:47:53  [ERROR] 
00:47:53  
00:47:53  See /home/jenkins/agent/workspace/Core_jenkins_PR-10208/test/target/surefire-reports for the individual test results.

00:51:21  [ERROR] Errors: 
00:51:21  [ERROR]   MyViewTest.testDoCreateItem:93 » Script TypeError: Cannot set property "value" of null to "" (http://localhost:38409/jenkins/static/86cd0c78/jsbundles/add-item.js#96)
00:51:21  [INFO] 
00:51:21  [ERROR] Tests run: 2214, Failures: 0, Errors: 1, Skipped: 55
00:51:21  [INFO] 
00:51:21  [ERROR] 
00:51:21  
00:51:21  See /home/jenkins/agent/workspace/Core_jenkins_PR-10208/test/target/surefire-reports for the individual test 

Ref: https://ci.jenkins.io/job/Core/job/jenkins/job/PR-10208/2/console

[janfaracik]

It looks like some JUnit tests are now failing after the removal of JQuery from the "New item" page:

00:47:53  [ERROR] Errors: 
00:47:53  [ERROR]   MyViewTest.testDoCreateItem:93 » Script TypeError: Cannot set property "value" of null to "" (http://localhost:34599/jenkins/static/44ddddd0/jsbundles/add-item.js#96)
00:47:53  [INFO] 
00:47:53  [ERROR] Tests run: 2214, Failures: 0, Errors: 1, Skipped: 55
00:47:53  [INFO] 
00:47:53  [ERROR] 
00:47:53  
00:47:53  See /home/jenkins/agent/workspace/Core_jenkins_PR-10208/test/target/surefire-reports for the individual test results.

00:51:21  [ERROR] Errors: 
00:51:21  [ERROR]   MyViewTest.testDoCreateItem:93 » Script TypeError: Cannot set property "value" of null to "" (http://localhost:38409/jenkins/static/86cd0c78/jsbundles/add-item.js#96)
00:51:21  [INFO] 
00:51:21  [ERROR] Tests run: 2214, Failures: 0, Errors: 1, Skipped: 55
00:51:21  [INFO] 
00:51:21  [ERROR] 
00:51:21  
00:51:21  See /home/jenkins/agent/workspace/Core_jenkins_PR-10208/test/target/surefire-reports for the individual test 

Ref: https://ci.jenkins.io/job/Core/job/jenkins/job/PR-10208/2/console

Thanks! Fixed now, forgot to try it with no existing jobs.

[krisstern]

Thanks! Fixed now, forgot to try it with no existing jobs.

Awesome!