[JENKINS-70115] The full width side panel's right side is too close to the border

[1weiho]

See JENKINS-70115.

Before:

After:

Testing done

Proposed changelog entries

• Add padding to the right side of the full width side panel.

Proposed upgrade guidelines

N/A

Submitter checklist

• The Jira issue, if it exists, is well-described.
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Desired reviewers

@mention

Maintainer checklist

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

• There are at least two (2) approvals for the pull request and no outstanding requests for change.
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[1weiho]

I have changed to target #tasks in body.two-column so that the executor and node widgets will not be affected.

[github-actions]

Please take a moment and address the merge conflicts of your pull request. Thanks!

[daniel-beck]

Also fixes the corresponding issue on job configuration forms 👍

[timja]

/label ready-for-merge

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This PR is now ready for merge, after ~24 hours, we will merge it if there's no negative feedback.

Thanks!