Fix unresolved imports with IntelliJ 2024.1+

[vga91]

With newer versions of IntelliJ (from 2024.1.x),
the imports of other java classes in extended are not properly detected without this fix.

See the Slack discussion: https://neo4j.slack.com/archives/C136J23GE/p1723459229156629

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EDIT:
Added another commit, since a similar problem occurs in extended-it module,
that is, we cannot import classes, if they are from the moduleextended, in another package name.

Therefore, without the change committed,

testImplementation project(':extended').sourceSets.main.allJava

we cannot e.g. import JdbcUtil (coming from package apoc.load.util) into class `` (package apoc.load),
even if this line is present:

implementation project(":extended")