Addresses some of #490 Plan output improvement

[smoy]

What changed?

• Only output the Exception section if there are exceptions
• Aggregate Create, Update, Delete, Detach, Attach actions instead of outputting just n distinct actions

Rationale

• Address the usability suggestions from Improvements to GitHub App Plan Comments #490

How was it tested?

If it was manually verified, list the instructions for your reviewers to follow.

• Unit Tests
• Functional Tests
• Manually Verified

See https://github.com/noqdev/iambic-templates-itest/pull/322

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02% 🎉

Comparison is base (3658c52) 83.74% compared to head (d51be9a) 83.77%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #550      +/-   ##
==========================================
+ Coverage   83.74%   83.77%   +0.02%     
==========================================
  Files         105      105              
  Lines       12232    12248      +16     
==========================================
+ Hits        10244    10261      +17     
+ Misses       1988     1987       -1     

Flag	Coverage Δ
functional_tests	65.95% <100.00%> (+0.12%)	⬆️
functional_tests_config_discovery	46.02% <0.00%> (-0.07%)	⬇️
unit_tests	74.05% <100.00%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
iambic/output/models.py	96.06% <100.00%> (+0.38%)	⬆️

... and 1 file with indirect coverage changes

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[castrapel]

LGTM