Installation Wizard: Don't prompt the user to install the PMPro Upgrade Manager if it's already active.

[georgestephanis]

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Changes proposed in this Pull Request:

Add a conditional to the wizard so if the update manager is already installed and active, it doesn't prompt the user to install and activate it.

While this does mean that in the processing script it will try to install it, it will just short out as it's already active.

Unsure if it would be better to tweak this conditional to not rely on the constant from the update manager but do a is_plugin_active check. The constant would catch configurations where it lives in mu-plugins, but that's probably not ideal as it's harder to update.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
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Changelog entry

Installation Wizard: Don't prompt the user to install the PMPro Upgrade Manager if it's already active.

[Copilot]

Pull request overview

This PR prevents the Installation Wizard from prompting users to install the PMPro Update Manager if it's already active on their site. The change improves the user experience by removing unnecessary prompts for plugins that are already installed and activated.

Key Changes:

• Wraps the Update Manager installation prompt in a conditional check using defined( 'PMPROUM_VERSION' )
• Fixes a minor spacing issue in a label attribute (for ="updatemanager" → for="updatemanager")

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