DOCS-906 - Copilot-to-Mobot change

[kimsauce]

Purpose of this pull request

Copilot multi-turn conversations Beta release notes and name change. Multi-turn doc-only PR is here.

Select the type of change

• Minor Changes - Typos, formatting, slight revisions
• Update Content - Revisions, updating sections
• New Content - New features, sections, pages, tutorials
• Site and Tools - .clabot, version updates, maintenance, dependencies, new packages for the site (Docusaurus, Gatsby, React, etc.)

Ticket (if applicable)

https://sumologic.atlassian.net/browse/DOCS-906

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[jpipkin1]

The new beta article for multi-turn conversations is fantastic, @kimsauce! I have only a few minor suggestions.

You'll also need to update screenshots in these articles that show the old "Copilot" name:

• https://help.sumologic.com/docs/get-started/sumo-logic-ui/
• https://help.sumologic.com/docs/get-started/sumo-logic-ui-classic/