Sanity test script enhancement and doc update

[qianheng-aws]

Description

Some minor update:

1. Add openpyxl as the prerequisite package in README
2. Put response json in error message so it can show in the final report
3. Print test status for each test query in the log, then we can quick check status in process.

Related Issues

Check List

• [x] Updated documentation (docs/ppl-lang/README.md)
• [ ] Implemented unit tests
• [ ] Implemented tests for combination with other commands
• [ ] New added source code should include a copyright header
• [x] Commits are signed per the DCO using --signoff

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