Adapt configuration pages to jenkinsci/jenkins#11222

[aneveux]

Hello 👋

Recently, jenkinsci/jenkins#11222 introduced a new experimental Manage Jenkins layout.
Plugins have to be updated for this new UI, and this PR proposes a simple fix.

Before the Changes:

Without the new UI (`mvn hpi:run`)

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With the new UI (`mvn hpi:run -Dmaven.hpi.run.jvmArgs="-Dnew-manage-jenkins.flag.defaultValue=true"`)

After the Changes:

Without the new UI (`mvn hpi:run`)

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With the new UI (`mvn hpi:run -Dmaven.hpi.run.jvmArgs="-Dnew-manage-jenkins.flag.defaultValue=true"`)

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This requires a bump of the Jenkins version to get the new UI flag.
This is a very minor change, which just removes the broken sidebar on the page.

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Thanks a lot for your review! ❤️

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This change is 

[nevingeorgesunny]

in the

With the new UI (mvn hpi:run -Dmaven.hpi.run.jvmArgs="-Dnew-manage-jenkins.flag.defaultValue=true")

In the image here , there needs to. be a side panel right? not sure if im missing something

[aneveux]

in the

With the new UI (mvn hpi:run -Dmaven.hpi.run.jvmArgs="-Dnew-manage-jenkins.flag.defaultValue=true")

In the image here , there needs to. be a side panel right? not sure if im missing something

I don't think so, it's coming from an Admin Monitor, it's not a configuration page per se.
The fix is actually to avoid seeing an unrelated sidebar.