Add default status if PBS job status fails

[nefrathenrici]

Purpose

Fixes #213

To-do

Content

Updates the job_status(jobid::PBSJobID) function to return a default state :RUNNING if the qstat command fails silently.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 39 lines in your changes missing coverage. Please review.
✅ Project coverage is 35.74%. Comparing base (33cefaa) to head (4f7b388).

Files with missing lines	Patch %	Lines
src/pbs.jl	0.00%	39 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #217      +/-   ##
==========================================
- Coverage   36.90%   35.74%   -1.17%     
==========================================
  Files          12       12              
  Lines         924      954      +30     
==========================================
  Hits          341      341              
- Misses        583      613      +30     

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