chore: add paymaster e2e test

[jackpooleyml]

Description

Adds a e2e paymaster test

[github-actions]

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[cpb8010]

yay tests

[Copilot]

Pull request overview

Adds an end-to-end Rust test covering paymaster-sponsored flows in the zksync-sso-erc4337-core crate.

Changes:

• Introduces a new paymaster e2e test that deploys an account via paymaster sponsorship and creates a session.
• Wires the new test module into the erc4337::paymaster module under cfg(test).
• Exposes generate_session_proof from the session create.rs test module for reuse by the new paymaster test.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
.../src/erc4337/paymaster/paymaster_test.rs	Adds a new e2e paymaster test that deploys via paymaster and creates a session.
.../src/erc4337/paymaster.rs	Registers the new paymaster_test module behind cfg(test).
.../src/erc4337/account/modular_smart_account/session/create.rs	Makes the test module / helper function visible so other tests can reuse generate_session_proof.

Comments suppressed due to low confidence (1)

packages/sdk-platforms/rust/zksync-sso-erc4337/crates/zksync-sso-erc4337-core/src/erc4337/account/modular_smart_account/session/create.rs:135

• generate_session_proof only needs to be callable from other test modules within this crate. Consider reducing visibility to pub(crate) (or pub(super) if appropriate) so it can’t be referenced from outside the crate’s tests via pub paths.

    pub fn generate_session_proof(
        session_spec: &SessionSpec,
        account_address: Address,
        signer_private_key: &str,
    ) -> eyre::Result<Bytes> {

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[cpb8010]

Still good! 😊