gradle run --debug-jvm is explained twice

We are already explaining how to debug remotely in `Debugging from an IDE` section.
We can remove one.

TESTING.asciidoc

@@ -25,12 +25,6 @@ run it using Gradle:
 gradle run
 -------------------------------------
 
-or to attach a remote debugger, run it as:
-
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-gradle run --debug-jvm
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-
 === Test case filtering.
 
 - `tests.class` is a class-filtering shell-like glob pattern,