Remove the default Maven phase bound to the metadata-copy Maven goal to simplify the use of integration tests

[linghengqian]

• Fixes Feature Request: Run integration tests picked up by maven-failsafe-plugin in native mode #112 .
• Remove the default Maven phase bound to the metadata-copy Maven goal to simplify the use of integration tests.
• This discovery was first reported in Change the execution phase of NativeTest under GraalVM Native Image from test to integration-test apache/shardingsphere#36050 and Native Build Tools cannot recognize Maven modules that only have pom.xml but no source code #727 .
• In NBT 0.11.0, even if metadata-copy is not explicitly used on the command line, the metadata-copy goal will be executed in the prepare-package phase, which affects the processing of the integration-test phase, resulting in the following cumbersome logic to change the metadata-copy goal. Since metadata-copy is always used manually through the command line like ./mvnw -Pnative test native:metadata-copy, metadata-copy should not be tied to a specific maven phase at all.

<profile>
            <id>metadata-copy</id>
            <build>
                <plugins>
                    <plugin>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-failsafe-plugin</artifactId>
                        <version>3.5.3</version>
                        <executions>
                            <execution>
                                <goals>
                                    <goal>integration-test</goal>
                                    <goal>verify</goal>
                                </goals>
                            </execution>
                        </executions>
                    </plugin>
                    <plugin>
                        <groupId>org.graalvm.buildtools</groupId>
                        <artifactId>native-maven-plugin</artifactId>
                        <version>0.11.0</version>
                        <extensions>true</extensions>
                        <executions>
                            <execution>
                                <id>merge-agent-files-in-integration-test</id>
                                <goals>
                                    <goal>merge-agent-files</goal>
                                </goals>
                                <phase>integration-test</phase>
                            </execution>
                             <execution>
                                    <id>metadata-copy-manually</id>
                                    <goals>
                                        <goal>metadata-copy</goal>
                                    </goals>
                                    <phase>deploy</phase>
                                </execution>
                        </executions>
                        <configuration>
                            <skipNativeTests>true</skipNativeTests>
                            <agent>
                                <enabled>true</enabled>
                                <defaultMode>Standard</defaultMode>
                                <metadataCopy>
                                    <disabledStages>
                                        <stage>main</stage>
                                    </disabledStages>
                                    <merge>false</merge>
                                </metadataCopy>
                            </agent>
                        </configuration>
                    </plugin>
                </plugins>
            </build>
        </profile>