HPCC-33499 Update esdltests failure identification and reporting

- Use CPPUNIT macros for testing success and printing messages on failure.
- Print timing and other non-failure test information using DBGLOG to leverage
  the -v verbose option. Re-direct script context tracing away from stdout for
  the same reason.

Some test cases generate expected errors. Since the underlying libxml2 prints
parsing and XPath errors and warnings to stderr, you will see messages that
look like failures even when all tests succeed. A separate ticket is opened
to suppress these errors and warnings: HPCC-33544.

Signed-off-by: Terrence Asselin <[email protected]>

Author: asselitx