docs(ant): document Ivy-based provisioning for Ant plugin

[Artuiro-23]

This PR documents how to provision the Dependency-Check Ant plugin using Apache Ivy,
providing an alternative to the existing manual JAR installation.

It adds an Ivy-based build.xml example to the Ant documentation.

Fixes #7749

[Copilot]

Pull request overview

This PR adds documentation for using Apache Ivy to provision the Dependency-Check Ant plugin as an alternative to manual JAR installation.

• Adds a new "Installation Using Apache Ivy" section with a build.xml example
• Provides an automated dependency management approach for the Ant plugin
• Aims to simplify setup and ensure version consistency across environments

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[Copilot]

The Ivy example is incomplete and will not work as provided. The ivy:retrieve task on line 55 requires an ivy.xml file to specify which dependencies to download, but this file is not mentioned or shown in the documentation.

Users following this example will encounter an error because:

1. No ivy.xml file exists to define the dependency-check-ant dependency
2. The Maven coordinates (groupId, artifactId, version) for dependency-check-ant are not specified

The documentation should either:

• Include a complete ivy.xml example showing how to declare the dependency-check-ant dependency (e.g., org.owasp:dependency-check-ant:${project.version})
• Explain that users need to create an ivy.xml file with the appropriate dependency declaration
• Show the complete Ivy setup including both the build.xml and ivy.xml files

[Copilot]

The scanSet attribute is used incorrectly. According to the Ant task API, scanSet is not a simple string attribute - it should be a nested element that defines a fileset or path to scan.

The correct usage should be something like:

<dependency-check projectName="Example Project" format="HTML">
    <fileset dir="src">
        <include name="**/*.jar"/>
    </fileset>
</dependency-check>

Or use the scanPath attribute if providing a path reference. The current example with scanSet="src" will likely result in an error or unexpected behavior.

Suggested change

	scanSet="src"
	format="HTML"/>
	format="HTML">
	<fileset dir="src">
	<include name="**/*.jar"/>
	</fileset>
	</dependency-check>

[jeremylong]

See copilot comments.

[marcelstoer]

@Artuiro-23 Since you already added some Ivy documentation in #8202, is this still relevant?