SignatureTest Generation

Some sources for more information:

1. This README: https://github.com/eclipse-ee4j/batch-tck/blob/master/com.ibm.jbatch.tck/sigtest/README.md
2. The Batch TCK reference guide: https://github.com/eclipse-ee4j/batch-tck/blob/master/jakarta.batch.official.tck/src/main/asciidoc/batch-tck-reference-guide.adoc

Some anomalies:

In producing the EE 9 standalone Batch TCK, we did see more than one distinct version of the signature files generated across different JDKs. We weren't able to pin this down, but as a data point, here are the additional copies for reference:

1. SE 11 signature here: https://github.com/eclipse-ee4j/batch-tck/blob/178ce2d9a64d9f1b21a1f849dae77cc57e6435bb/com.ibm.jbatch.tck/sigtest/batch.standalone.tck.sig_2.0_se11
2. SE 8 signature here: https://github.com/eclipse-ee4j/batch-tck/blob/60282fa63bb7841bba4db831f0c1e7e20d3c9cb9/com.ibm.jbatch.tck/sigtest/batch.standalone.tck.sig_2.0_se8