fix: Some uncaught exceptions related to billing

[ajay-sentry]

Purpose/Motivation

Want to prevent some noisy sentry exceptions from occurring if we can help it. This PR fixes the following:

• Subscription Deletion error when user subscription has already been deleted. This may occur when a webhook gets retried after a subscription has already been deleted off a user
• Subscription schedule created/updated failing to grab obo_organization:
  • This occurs when we're pulling obo_organization off metadata in an unsafe way. We want to use .get() to protect in the event it is null.
  • Because those are only being used in the logs, I'm not too worried about any unintended behavior.

Sentry Links:
https://codecov.sentry.io/issues/4271768168/?project=5215654&project=4165036&project=4505562661847040&query=is%3Aunresolved+issue.priority%3A%5Bhigh%2C+medium%5D+billing&referrer=issue-stream&statsPeriod=14d&stream_index=3&utc=true
https://codecov.sentry.io/issues/5420354835/?project=5215654&project=4165036&project=4505562661847040&query=is%3Aunresolved+issue.priority%3A%5Bhigh%2C+medium%5D+billing&referrer=issue-stream&statsPeriod=14d&stream_index=5&utc=true
https://codecov.sentry.io/issues/5420354806/?project=5215654&project=4165036&project=4505562661847040&query=is%3Aunresolved+issue.priority%3A%5Bhigh%2C+medium%5D+billing&referrer=issue-stream&statsPeriod=14d&stream_index=6&utc=true

Links to relevant tickets

What does this PR do?

Include a brief description of the changes in this PR. Bullet points are your friend.

Notes to Reviewer

Anything to note to the team? Any tips on how to review, or where to start?

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[codecov-notifications]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

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[codecov-qa]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.53%. Comparing base (557388d) to head (9f50eb2).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

@@            Coverage Diff             @@
##             main     #604      +/-   ##
==========================================
+ Coverage   91.51%   91.53%   +0.02%     
==========================================
  Files         612      615       +3     
  Lines       16282    16323      +41     
==========================================
+ Hits        14901    14942      +41     
  Misses       1381     1381              

Flag	Coverage Δ
unit	91.53% <100.00%> (+0.02%)	⬆️
unit-latest-uploader	91.53% <100.00%> (+0.02%)	⬆️

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

Files	Coverage Δ
billing/views.py	97.01% <100.00%> (+0.06%)	⬆️

... and 6 files with indirect coverage changes

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[codecov-public-qa]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.53%. Comparing base (557388d) to head (9f50eb2).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found ☺️

@@            Coverage Diff             @@
##             main     #604      +/-   ##
==========================================
+ Coverage   91.51%   91.53%   +0.02%     
==========================================
  Files         612      615       +3     
  Lines       16282    16323      +41     
==========================================
+ Hits        14901    14942      +41     
  Misses       1381     1381              

Flag	Coverage Δ
unit	91.53% <100.00%> (+0.02%)	⬆️
unit-latest-uploader	91.53% <100.00%> (+0.02%)	⬆️

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

Files	Coverage Δ
billing/views.py	97.01% <100.00%> (+0.06%)	⬆️

... and 6 files with indirect coverage changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.92%. Comparing base (557388d) to head (9f50eb2).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@               Coverage Diff                @@
##               main       #604        +/-   ##
================================================
+ Coverage   95.90000   95.92000   +0.02000     
================================================
  Files           790        793         +3     
  Lines         17600      17664        +64     
================================================
+ Hits          16880      16944        +64     
  Misses          720        720                

Flag	Coverage Δ
unit	91.53% <100.00%> (+0.02%)	⬆️
unit-latest-uploader	91.53% <100.00%> (+0.02%)	⬆️

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

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