Add test coverage for get_code_length() and autosubmit filters

[Copilot]

The new get_code_length() static method, two_factor_code_length filter, and two_factor_autosubmit_length filter introduced in #820 had no test coverage.

Changes

tests/providers/class-two-factor-provider.php

• test_get_code_length_returns_default — get_code_length() returns its $default argument when no filter is hooked
• test_get_code_length_filter_overrides_default — two_factor_code_length filter overrides the default
• test_get_code_with_null_uses_filtered_length — get_code(null) delegates to get_code_length(), picking up the filtered value

tests/providers/class-two-factor-backup-codes.php

• test_autosubmit_length_filter_affects_authentication_page — two_factor_autosubmit_length filter changes the data-digits attribute in the rendered authentication page HTML; also covers the __return_zero disable-autosubmit use case documented in the readme

add_filter( 'two_factor_autosubmit_length', '__return_zero' );
// authentication_page() now renders: data-digits="0"

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