feat: add notifications icon in page header

[AbhishekA1509]

Description

This pull request introduces a new notifications feature for AI Recommendations and removes legacy AI Recommendations routes and navigation items. The main changes include adding a notifications button to the page header for super admins, updating context types to support this feature, and cleaning up unused constants and navigation IDs related to AI Recommendations.

AI Recommendations Notifications Feature:

• Added a notifications button to the PageHeader component, visible to super admins, which opens a temporary window displaying AI Recommendations notifications. [1] [2] [3]
• Integrated the new bell icon (ic-bell) for the notifications button in the icon map and imports. [1] [2]

Context and Type Updates:

• Extended the MainContext type to include an optional AIRecommendations component, supporting the notifications feature. [1] [2] [3]
• Updated context usage in PageHeader to access new AI Recommendations properties.

Cleanup of Legacy AI Recommendations Code:

• Removed unused AI Recommendations routes and constants from Constants.ts and navigation item IDs. [1] [2] [3]
• Bumped the package version to 1.20.6-pre-46 in package.json.

New Route Addition:

• Added a new route for Automation Enablement Runbooks in Constants.ts.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Test A
• Test B

Checklist

• The title of the PR states what changed and the related issues number (used for the release note).
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

The base branch was changed.