Make the value entering of the billing state field in e2e test compatible with WC < 9.2

[eason9487]

Changes proposed in this Pull Request:

While performing the release in #456, the e2e test keep failing. Ref: #454

This PR make it compatible with WC < 9.2.

Checks:

• Does your code follow the WordPress coding standards?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Detailed test instructions:

1. npm run wp-env:up
2. npm run -- wp-env run tests-cli -- wp plugin update woocommerce --version=9.1.4 && npm run -- wp-env run tests-cli -- wp wc update
3. npm run test:e2e
4. Confirm tests pass
5. npm run -- wp-env run tests-cli -- wp plugin update woocommerce --version=9.2.0-rc.1 && npm run -- wp-env run tests-cli -- wp wc update
6. npm run test:e2e
7. Confirm tests pass

Changelog entry

[eason9487]

Ran e2e test with WooCommerce 9.1.4 and 9.2.0-rc.1 via GitHub actions:

• 9.1.4: https://github.com/woocommerce/woocommerce-google-analytics-integration/actions/runs/10386823960/job/28758927957
• 9.2.0-rc.1: https://github.com/woocommerce/woocommerce-google-analytics-integration/actions/runs/10386911462/job/28759208867

I will be merging this PR without code reviews.