fixing minor issues in scpi_psu and bluefors agents

[CAWNoodle]

log result of scpi_psu's get_output task always returned 'disabled' even when it was actually enabled; bluefors agent not recognizing log file types based on capitalization (e.g. Heaters vs. heaters)

Description

For SCPI_PSU: set the enabled variable based on the outcome of the get_output() driver function. This was the original intent, but the check was lost during rearranging of the session data structure.

For bluefors:
Added the flags=re.I option to each of the regex checks to make them case-insensitive.

Motivation and Context

For SCPI_PSU: The change is mostly for debugging. The correct state of the output was already being reported in the session data, but the log output wasn't properly reflecting this.

For bluefors: The new Bluefors Temperature Controller saves the Heaters log files with a capital 'H' whereas Lakeshore is lower-case. The contents and other formatting is identical however. This change should now treat both cases the same.

How Has This Been Tested?

Attempted to run python3 -m pytest --cov but execution seem to hang at the HWP Supervisor.

Otherwise, the only testing has been with our lab's setup:
Influxdb Agent
Aggregator Agent
Bluefors Agent
SCPI PSU Agent
Fakedata Agent
Labjack Agent
Cryomech CPA Agent

Types of changes

• [x ] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x ] My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.