[DO NOT MERGE] Stripe Tax extension promotional banner

[wjrosa]

Fixes STRIPE-793
Figma 0fiyiUe18lGU6kGyQNmXxE-fi
Discussion p1762342846828169-slack-C06ETDR8APN

Changes proposed in this Pull Request:

We are introducing a new promotional banner surface to promote the Stripe Tax extension. This banner will appear for merchants with the Optimized Checkout feature enabled. The CTA button will open https://woocommerce.com/products/stripe-tax/, while the "Learn more" link will point to https://stripe.com/tax.

The updated copy was defined in the Slack discussion thread.

Preview:

We are still waiting for Stripe to approve the final copy.

Testing instructions

• Checkout and build this branch on your test environment (add/stripe-tax-extension-promotional-banner)
• As a merchant, make sure that both the PMC Sync and the Optimized Checkout feature are enabled
• Confirm the new banner is displayed in the payment methods page (wp-admin/admin.php?page=wc-settings&tab=checkout&section=stripe&panel=methods) and in the Stripe settings page (wp-admin/admin.php?page=wc-settings&tab=checkout&section=stripe&panel=settings)
• Confirm the visuals match the Figma file and the preview above
• Click the "Learn more" link
• Confirm it sends you to: https://stripe.com/tax
• Click the "Get Stripe Tax" CTA
• Confirm it sends you to: https://woocommerce.com/products/stripe-tax/
• Click the "Dismiss" link
• Confirm the banner is gone

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• Covered with tests (or have a good reason not to test in description ☝️)
• Tested on mobile (or does not apply)

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Post merge

• Added testing instructions to the Release Testing Instructions wiki page (or does not apply)
• Added the needs docs label (or does not apply)
• Included this PR in the Release Thread scope (or does not apply)

[wjrosa]

Just removing this as it is not needed

[malithsen]

Looks good!