Maven resources plugin does not honour maven.test.skip flag

### Affected version

4.0.0-beta-2-SNAPSHOT

### Bug description

The following integration test fails when Maven Resource Plugin 4.0.0-beta-2-SNAPSHOT is tested with Maven 4.0.0-rc-6:

* `src/it/MRESOURCES-131` (GitHub issue #217)

This integration test has the following configuration in its `pom.xml`:

```xml




maven-resources-plugin
@project.version@

true





```

The `ResourcesMojo` class has the following field:

```java
/**
* You can skip the execution of the plugin if you need to. Its use is NOT RECOMMENDED, but quite convenient on
* occasion.
*
* @since 3.0.0
*/
@Parameter(property = "maven.resources.skip", defaultValue = "false")
private boolean skip;
```

The `TestResourcesMojo` class has the following field:

```java
/**
* Set this to 'true' to bypass copying of test resources.
* Its use is NOT RECOMMENDED, but quite convenient on occasion.
* @since 2.6
*/
@Parameter(property = "maven.test.skip", defaultValue = "false")
private boolean skip;
```

I verified in the debugger that the `skip` flag is `true` in `ResourcesMojo` but not in `TestResourcesMojo`.

Start with the failing integration test in src/it/MRESOURCES-131 and its pom.xml, then compare the skip parameters in ResourcesMojo and TestResourcesMojo. Run the integration test with Maven 4.0.0-rc-6 and verify that maven.test.skip prevents test-resource copying as expected.

Written by the indexing model from the issue text.