Rename Product Analytics to Product Intelligence in docs

What does this MR do?

This MR is a part of gitlab-com/www-gitlab-com#10100 (closed). It makes the following changes:

• Rename Product Analytics to Product Intelligence
• Deprecates the folder Product Analytics and moves snowplow.md and usage_ping.md up a level.
• Updates redirects to point to new location of snowplow.md, usage_ping.md, or the product intelligence guide

Related issues

Author's checklist (required)

• Follow the Documentation Guidelines and Style Guide.
• If you have Developer permissions or higher:
  • Ensure that the product tier badge is added to doc's h1.
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  • Assign the designated Technical Writer.

Do not add the feature, frontend, backend, ~"bug", or database labels if you are only updating documentation. These labels will cause the MR to be added to code verification QA issues.

When applicable:

• Update the permissions table.
• Link docs to and from the higher-level index page, plus other related docs where helpful.
• Add the product tier badge accordingly.
• Add GitLab's version history note(s).
• Add/update the feature flag section.

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