Add MongoDB integration tests for all strfmt BSON types

[Copilot]

• Create integration test module with separate go.mod
• Upgrade to mongo-driver v2 and run go mod tidy
• Fix bson.M → bson.D type assertions for mongo-driver v2 compatibility (nested docs decode as bson.D in v2)
• Verify tests compile correctly

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.01%. Comparing base (8a8c741) to head (374e2c0).
⚠️ Report is 4 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #215   +/-   ##
=======================================
  Coverage   85.01%   85.01%           
=======================================
  Files          14       14           
  Lines        2015     2015           
=======================================
  Hits         1713     1713           
  Misses        218      218           
  Partials       84       84           

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[fredbi]

@copilot this is rebased. Please upgrade mongo driver to v2 and go mod tidy

[Copilot]

@copilot this is rebased. Please upgrade mongo driver to v2 and go mod tidy

Done in f8f788d. Updated integration test module to go.mongodb.org/mongo-driver/v2 v2.5.0 — updated imports (v2/bson, v2/mongo, v2/mongo/options), adapted mongo.Connect call for v2 API (no context param), replaced primitive.* types with bson.*, and ran go mod tidy.

[fredbi]

@copilot fixing the integration test after mongodb upgrade to v2 seems more complex than first expected. All tests fail with a message similar to:

=== RUN TestSSN
mongo_test.go:401: expected bson.M for value, got bson.D

[Copilot]

@copilot fixing the integration test after mongodb upgrade to v2 seems more complex than first expected. All tests fail with a message similar to:

=== RUN TestSSN
...

Fixed in 374e2c0. In mongo-driver v2, nested sub-documents within a decoded bson.M are returned as bson.D (ordered) instead of bson.M. Updated all type assertions for result["value"] from bson.M to bson.D in TestDate, TestDuration, TestBase64, TestULID, and the stringFormatRoundTrip helper. bson.Marshal(bson.D{...}) works the same as bson.Marshal(bson.M{...}) so the roundtrip logic is unchanged.