Add single datasource enforcement config

[evanpurkhiser]

Introduces enforce_single_datasource on the base detector validator to restrict specific detector types (Uptime and Crons) to a single data source.

This prevents invalid configurations where these detectors might be set up with multiple data sources, which is not supported for their intended functionality.

Legal Boilerplate

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

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Slack Thread

 

[cursor]

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[evanpurkhiser]

@cursor use a docstring for this

[cursor]

Done! I've converted the inline comment to a proper docstring format at the class level. The docstring now:

• Explains that subclasses should set this to True to enforce single data source validation
• Provides context on why this exists (preventing invalid configurations)
• Uses proper multi-line docstring format

This is the standard Python approach for documenting class-level configuration attributes like enforce_single_datasource.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #103870      +/-   ##
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+ Coverage   78.98%    80.24%   +1.25%     
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  Files        9315      9301      -14     
  Lines      397577    399425    +1848     
  Branches    25393     25247     -146     
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+ Hits       314032    320515    +6483     
+ Misses      83093     78450    -4643     
- Partials      452       460       +8     

[ceorourke]

the placement of that docstring is wild to me but I won't block