Prune Jenkins plugins on ci.nodejs.org

[targos]

Based on the discussion and experiments in https://github.com/nodejs/build/issues/3291, I removed the following plugins today:

• Jython (needed to remove Ant)
• Ivy (needed to remove Ant)
• Ant
• Bootstrap 4 API Plugin
• JavaScript GUI Lib: ACE Editor bundle plugin
• JavaScript GUI Lib: Handlebars bundle plugin
• JavaScript GUI Lib: jQuery bundles (jQuery and jQuery UI) plugin
• JavaScript GUI Lib: Moment.js bundle plugin
• jnr-posix API Plugin
• Popper.js 2 API Plugin
• Popper.js API Plugin
• WMI Windows Agents Plugin
• LDAP
• Subversion
• Role-based Authorization Strategy

I also disabled Platform Labeler

[targos]

I think we can remove https://plugins.jenkins.io/lockable-resources/. https://ci.nodejs.org/lockable-resources/ is empty.

[targos]

I just removed the Lockable Resources plugin, and took the opportunity to install pending plugin updates.

[targos]

Disabled plugins with known security vulnerabilities:

• https://plugins.jenkins.io/global-variable-string-parameter/ (seems unused)
• https://plugins.jenkins.io/ghprb/ (only enabled in citgm-smoker-nobuild, but I've never seen its effect)
• https://plugins.jenkins.io/ownership/ (seems unused)

[targos]

Also disabled unused plugins:

• https://plugins.jenkins.io/yaml-axis/
• https://plugins.jenkins.io/slave-prerequisites/
• https://plugins.jenkins.io/simple-parameterized-builds-report/
• https://plugins.jenkins.io/saml/
• https://plugins.jenkins.io/python/
• https://plugins.jenkins.io/publish-over-ssh/
• https://plugins.jenkins.io/workflow-cps-global-lib/
• https://plugins.jenkins.io/periodic-reincarnation/
• https://plugins.jenkins.io/nvm-wrapper/
• https://plugins.jenkins.io/offlineonfailure-plugin/
• https://plugins.jenkins.io/mercurial/

[targos]

Today I removed the plugins and restarted Jenkins.