Settings: Remove security settings

[lsl]

Remove security settings page from the duplicate views experiment, this page has already been hidden for classic view users.

Soft dependency on #98188 but this can be shipped separately.

• Hide the security page menu item from duplicate view experiment users
• Add a calypso redirect to Jetpack security settings for this route when the experiment is enabled p1737077066960599/1737076323.968059-slack-CRWCHQGUB / Redirect /settings/security/:site to Jetpack security settings #98514

[github-actions]

OpenAI suggested the following labels for this issue:

• [Feature Group] Site Settings & Tools: The issue is related to changes in the site's security settings, indicating a modification to site management tools.
• [Feature] User & Account Settings (/me): This label is relevant as it pertains to user security settings, which affect how users manage their accounts on the platform.
• [Feature] Authentication: This label applies since removing security settings directly impacts the authentication processes users rely on.