Update addJob() to accept multiple degradation jobs (functions)

[RDaxini]

Describe your changes

Basic principle of this change:
extracts the original "adding" component to a helper function, creates a modified addJob function loops over the helper, and includes checks for compatibility (raises errors otherwise)

other notes:
func_kwarg argument is removed. now, func takes both the function(s) and the(ir) respective argument(s)

Issue ticket number and link

Fixes #181

Type of change

Please delete options that are not relevant.

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist before requesting a review

• I have performed a self-review of my code
• Code changes are covered by tests.
• Code changes have been evaluated for compatibility/integration with Scenario analysis (for future PRs)
• Code changes have been evaluated for compatibility/integration with geospatial autotemplating (for future PRs)
• New functions added to init.py
• API.rst is up to date, along with other sphinx docs pages
• Example notebooks are rerun and differences in results scrutinized
• What's new changelog has been updated in the docs

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.97%. Comparing base (2bacff5) to head (59562b4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #318      +/-   ##
==========================================
+ Coverage   74.72%   74.97%   +0.24%     
==========================================
  Files          41       41              
  Lines        4823     4867      +44     
==========================================
+ Hits         3604     3649      +45     
+ Misses       1219     1218       -1     

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