Improve support for DB2[z] empty table precondition

[MichaelKern-IVV]

Impact

• Bug fix (non-breaking change which fixes expected existing functionality)
• Enhancement/New feature (adds functionality without impacting existing logic)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Adds statements for DB2 to the TableIsEmptyGenerator

[MalloD12]

This looks ok to me. I manually test it against a DB2 instance by deploying a create table change and then the below changeset:

<changeSet id="tableIsEmptyShouldFail" author="flautert">
        <preConditions onFail="MARK_RAN">
            <tableIsEmpty tableName="csvdata"/>
        </preConditions>
        <!-- if table is dropped then next changesets will fail, thus it is an indirect check -->
        <dropTable tableName="csvdata" />
    </changeSet>

Which dropped the csvdata table successfully. See below:

Thanks @MichaelKern-IVV!

[sonarcloud]

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