Add location info to SecretScanningAlert

[mdfleury-wbd]

https://github.blog/changelog/2025-06-24-secret-scanning-rest-api-responses-including-first_location_detected-and-has_more_locations-are-now-generally-available/

Adding the new information for first location detected and has more locations in the secret alerts API

[gmlewis]

Thank you, @mdfleury-wbd!
Just one minor tweak, please, then we should be good to merge.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.25%. Comparing base (d88d529) to head (369ac68).
Report is 1 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #3645 +/- ##
=======================================
Coverage 91.25% 91.25% =======================================
Files 184 184 Lines 16311 16311 =======================================
Hits 14884 14884 Misses 1245 1245 Partials 182 182 

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[alexandear]

Please fix a typo in the title: SecreateScanningAlert -> SecretScanningAlert

[gmlewis]

Thank you, @mdfleury-wbd and @alexandear!
LGTM.
Merging.