Avoid saving disabled status when deleting a project

[jglick]

performDelete was calling makeDisabled to ensure that no new builds were scheduled for a project while it was being deleted. Unfortunately this API-level method was intended for general purposes, such as flipping the disabled flag on a valid project, and includes

jenkins/core/src/main/java/jenkins/model/ParameterizedJobMixIn.java

Lines 481 to 482 in da99f11

	save();
	ItemListener.fireOnUpdated(this);

which save config.xml to disk and fire a change, neither of which is necessary or desirable on a project which is about to be deleted.

Testing done

None directly, but seems to solve a race condition seen in a CloudBees CI proprietary test.

Proposed changelog entries

• Optimized project deletion.

Proposed upgrade guidelines

N/A

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[NotMyFault]

/label ready-for-merge

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