[Email Security] Update initial onboarding steps

[Maddy-Cloudflare]

This PR aims at updating the initial onboarding steps for API deployment and BCC/Journaling with Google Workspace.

[hyperlint-ai]

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PR Change Summary

Updated onboarding steps for Email Security to clarify user options based on their purchase and integration status.

• Clarified onboarding steps for Email Security based on purchase and integration status.
• Updated domain management instructions for Gmail BCC integration.
• Revised MX/Inline setup instructions to specify user requirements.

Modified Files

• src/content/docs/cloudflare-one/email-security/setup/post-delivery-deployment/api/office365-api.mdx
• src/content/docs/cloudflare-one/email-security/setup/post-delivery-deployment/bcc-journaling/bcc-setup/gmail-bcc-setup/enable-gmail-integration.mdx
• src/content/docs/cloudflare-one/email-security/setup/pre-delivery-deployment/mx-inline-deployment-setup.mdx

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[github-actions]

Preview URL: https://6e570dbe.preview.developers.cloudflare.com
Preview Branch URL: https://maddy-email-security-pcx-17304.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cloudflare-one/email-security/setup/post-delivery-deployment/bcc-journaling/bcc-setup/gmail-bcc-setup/enable-gmail-integration/	https://maddy-email-security-pcx-17304.preview.developers.cloudflare.com/cloudflare-one/email-security/setup/post-delivery-deployment/bcc-journaling/bcc-setup/gmail-bcc-setup/enable-gmail-integration/
https://developers.cloudflare.com/cloudflare-one/email-security/setup/post-delivery-deployment/api/office365-api/	https://maddy-email-security-pcx-17304.preview.developers.cloudflare.com/cloudflare-one/email-security/setup/post-delivery-deployment/api/office365-api/
https://developers.cloudflare.com/cloudflare-one/email-security/setup/pre-delivery-deployment/mx-inline-deployment-setup/	https://maddy-email-security-pcx-17304.preview.developers.cloudflare.com/cloudflare-one/email-security/setup/pre-delivery-deployment/mx-inline-deployment-setup/