Use QueryMonitorInterface instead of hard-coded DebugMonitor class

[AlterBrains]

Summary of Changes

Allow debug plugin to use instance of QueryMonitorInterface in query collector.

Currently, it's hard-coded to instance of DebugMonitor (which is a final class for some reason). Hence, we can't use custom monitors with debug plugin enabled.

Testing Instructions

Apply patch. Enable debug in global configuration and debug plugin.

Actual result BEFORE applying this Pull Request

See debug.

Expected result AFTER applying this Pull Request

See same debug, nothing is changed.

Link to documentations

Please select:

• No documentation changes for docs.joomla.org needed
• No documentation changes for manual.joomla.org needed

[ceford]

I have tested this item ✅ successfully on 1f1117f

No change in Database section of debug bar on applying this PR.

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