[Meta] Update Security UI side nav

[jmikell821]

Related PR: elastic/kibana#159185
Public issue: elastic/kibana#157847

Major changes:

• Former Manage -> Rules is moving to Rules.
• Manage -> Cloud Posture Benchmarks is moving under Rules -> Benchmark rules.
• Manage -> Shared Exception lists is moving under Rules -> Shared Exception lists.

Other Changes

SideNav package

• Styles updated according to the design
• New categories prop for the main panel links.
• New types of categories for the secondary panel links:
  • Title: Groups links under a category with a title label.
  • Separator: Groups links adding space with surrounding links
  • Accordion: Groups links in a EUI collapsible accordion (not used yet, will be needed for Serverless)
• The footerItems component prop has been removed in favor of the position?: 'top' | 'bottom' // default 'top' item attribute.
• New iconType optional item attribute to display the icon next to the SideNav link.
• All links texts now wrap instead of truncate.
• Links descriptions are no longer used.
• Secondary panel size updated, width reduced from 340px to 270px.

Before

After

Topics to review for updates:

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1. UI Overview

[nastasha-solomon]

@natasha-moore-elastic here are the notes I was going to add to my doc issue before I realized that I created a duplicate doc issue:

• The Settings section was re-named back to Manage.
• The Cloud Posture Benchmarks section was moved inside the Rules section (which you know was moved up a level to the main menu).
• @semd completed final changes on the main nav (for 8.10) in [Security Solution][Unified IA] New sections with landing page kibana#163102.

[natasha-moore-elastic]

Changes to be made

Update paths:

• Manage -> Rules to Rules -> Detection rules (SIEM)
• Manage -> Cloud Posture Benchmarks (currently documented as Manage -> CSP Benchmarks) to  Rules -> Benchmark rules
• Manage -> Shared Exception lists to Rules -> Shared exception lists

Update images/gifs that display the left nav:

• Elastic Security UI:
  • images/nav-overview.gif
  • cloud-native-security/images/findings-page.png (also on Cloud security posture management > Findings page and Kubernetes security posture management > Findings page) Will be updated in 8.9 CSPM and KSPM findings pages screenshot #3780
  • manage-pg.png
• AI Assistant:
  • images/assistant.gif

Update content:

• Elastic Security UI:
  • Under Manage, remove Rules, Share Exception Lists, and CSP Benchmarks bullet points
  • swap Cases and Timelines sections
  • swap Explore and Intelligence sections
  • Between Explore and Get started, add a new Rules section