test: Adjust sync_anchor_indices_migration test to reflect the recent bug fix

[aterga]

Motivation

Context. The migration has been patched to gracefully handle anchor memory corruption, and the canister has been fixed to not allocate new dangling anchors. Now the integration test needs to be adjuster to reflect that there is no way to introduce this issue using the latest canister version.

Changes

• No longer attempt to allocate dangling anchors in sync_anchor_indices_migration.

Tests

• The test in question (sync_anchor_indices_migration) has been adjusted accordingly.

[Copilot]

Pull Request Overview

This PR adjusts the sync_anchor_indices_migration test to reflect a recent bug fix that prevents the creation of dangling anchors. The test previously attempted to create a dangling anchor by using an excessively long name, but with the fix in place, this is no longer possible.

• Simplified anchor creation loop to create all anchors with valid names
• Updated expected recovery phrase count to match all created anchors
• Updated smoke test expectation for pub-key-0 to have an anchor

Comments suppressed due to low confidence (1)

src/internet_identity/tests/integration/upgrade.rs:12

• This import is unused and should be removed. The code does not reference the authn_method module anywhere in the file.

use internet_identity_interface::internet_identity::types::*;

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[sea-snake]

LGTM