fix(codecs): preserve logical types in generated Avro schema fixtures

[omwbennett]

Summary

The current Avro schema fixtures drop any schema metadata such as logicalType which makes it impossible to test the encoding/decoding of fields containing logical types e.g.

{
  "type": "int",
  "logicalType": "date"
}

To fix, serialize the schema with serde_json instead of canonical_form() to preserve the logical type annotations.

Vector configuration

N/A

How did you test this PR?

Re-ran cargo run --package codecs --bin generate-avro-fixtures and cargo test -p codecs avro passes.

Is this a breaking change?

• Yes
• No

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the no-changelog label to this PR.

References

• Related: Avro decoder doesn't support Date values #24773

Notes

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