feature: Add lastUpdatedDates for docs

[richardblack-Harness]

Description

• Add lastUpdatedDates to doc pages

PR contains

• A new custom plugin because docusaurus.config.ts sets the docs preset to false, so the built in option isn't available
• A new component to grab the last git commit for the file and render it
• global css rules to place the lastUpdatedDate under the frontmatter title of each page.

Proposed further additions:

• Add a CI stage to fetch the latest commits daily or add it to the build/deploy stage already in place

Screenshot / Preview

LastUpdatedDate.mp4

PRs must meet these requirements to be merged:

• Successful preview build.
• Code owner review.
• No merge conflicts.
• Release notes/new features docs: Feature/version released to at least one prod environment.

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