[Accounting] Fix issues that were breaking the rendering of accounting info

[gmarciani]

Description

Changes

Fix issues that were breaking the rendering of accounting info In particular:

1. fix the retrieval of compute nodes instance type to determine price estimate;
2. fix the generation of job properties rendered in the job accounting modal.

Also minor improvements to log lines related to accounting.

How Has This Been Tested?

Manually deployed and verified that the modal showed the accounting info per job is displayed.

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