Reduce test default log verbosity from verbose to debug

[abeltrano]

Type

• Bug fix
• Feature addition
• Feature update
• Documentation
• Build Infrastructure

Side Effects

• Breaking change
• Non-functional change

Goals

• Prevent ultra-verbose messages from appearing in test logs by default.

Technical Details

• The plog::verbose severity is the maximum that can be used and is now by convention, limited to wildly detailed information such as hex dumps of messages or other extremely verbose tracing information. As such, reduce the default log severity of all of the unit tests from plog::verbose to plog::debug.
• Drop the severity from some data streaming internal operations (eg. ReadDone, WriteDone, NextWrite) from plog::verbose to plog::debug as these were generating a lot of noise in the unit tests and were not necessary to be shown by default. Added a wrapper structure FunctionTraceVerbose for these more detailed invocations.

Test Results

• Re-ran unit tests and validated much fewer messages were printed.

Reviewer Focus

• None

Future Work

• None

Checklist

• Build target all compiles cleanly.
• clang-format and clang-tidy deltas produced no new output.
• Newly added functions include doxygen-style comment block.