ARTDAQSupervisor: improved python error propagation

[corrodis]

More work on python error propagation - I think this was really limiting us in today's efforts

[Copilot]

Pull request overview

This pull request improves Python error propagation in the ARTDAQSupervisor component by replacing direct error printing with structured error capture and propagation mechanisms. The changes enable better error diagnostics and debugging when Python/C API calls fail during DAQInterface initialization and operation.

Changes:

• Replaced PyErr_Print() calls with checkPythonError() + capturePyErr() pattern for better error capture
• Added error handling for DAQInterface constructor failures
• Added defensive null pointer check before using daqinterface_ptr_
• Modified captureStderrAndStdout_() to preserve pending Python errors
• Added MongoDB certificate file validation in startup script

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
tools/ots	Added MongoDB certificate validation checks and minor whitespace adjustment
otsdaq/ARTDAQSupervisor/ARTDAQSupervisor.cc	Improved Python error handling throughout - replaced PyErr_Print() with capturePyErr(), added DAQInterface constructor error checking, added null pointer safety check, and prevented error consumption in captureStderrAndStdout_()

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[rrivera747]

Looks good (after whitespace cleanup)