refactor(ses): extract receipt_action_xml from rule_to_xml

[vieiralucas]

Summary

The `rule_to_xml` helper in fakecloud-ses/src/v1.rs had a ~110-line nested `match` that inlined the XML wire-format of every `ReceiptAction` variant (S3, SNS, Lambda, Bounce, AddHeader, Stop) directly into the `for`-loop over `rule.actions`. Each variant has its own AWS XML element name (`S3Action`, `SNSAction`, …) and its own set of optional fields, so the only shared piece is the enclosing `` wrapper.

Move the match into `receipt_action_xml`. `rule_to_xml` drops from 130 lines to 30 and now clearly reads 'serialize the rule-level fields, recipients, then one `` per action'. Each variant's XML stays exactly the same.

Test plan

• `cargo fmt`
• `cargo clippy --workspace --all-targets -- -D warnings`
• `cargo test -p fakecloud-ses` (139 passed)

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Summary by cubic

Refactor SES receipt rule serialization by extracting receipt_action_xml from rule_to_xml. The generated XML is unchanged, and the code is shorter and easier to read.

• Refactors
  • Moved per-ReceiptAction formatting into receipt_action_xml; rule_to_xml now writes rule fields, recipients, and one <member> per action.
  • No behavior change; existing tests pass.

^{Written for commit b032a4a. Summary will update on new commits.}

[cubic-dev-ai]

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