[DOCS] Attack surface reduction / credential hardening

[joepeeples]

Description

New card added to Endpoint Security integration policy: Attack surface reduction card, with Credential hardening toggle:

Related

• https://github.com/elastic/security-team/issues/4185 - Get description of functionality here, and from dev team

Notes

• Windows only
• Confirm licensing requirements, if any
• Confirm if on/off by default