feat: Custom canonical tags

[coolguyzone]

DESCRIBE YOUR PR

We've been asked to update some canonical tags, the request is documented here: https://docs.google.com/spreadsheets/d/1jaP6A53p09vxoCLMhaX2RcynERN3PE0AsIAOJYNwq44/edit?usp=sharing

The codebase didn't have the capability to add custom canonical tags, so I added it through Frontmatter data, and updated the canonicals of the urls in the document above.

To verify:

Go to https://sentry-docs-git-custom-canonical-tags.sentry.dev/platforms/javascript/guides/react/configuration/options/ and inspect, you'll see a canonical tag as follows: <link rel="canonical" href="https://docs.sentry.io/platforms/javascript/configuration/options/">

Go to https://sentry-docs-git-custom-canonical-tags.sentry.dev/platforms/javascript/guides/react/session-replay/privacy/ and inspect and you'll see a canonical tag as follows: <link rel="canonical" href="https://docs.sentry.io/platforms/javascript/session-replay/privacy/">

Notice the canonical urls are different from the page urls. This works for all the urls requested in the user doc.

Go to any other docs page on my preview branch, and you'll see the canonical tag is the same as the page url, which is expected behavior.

I saw Jest is in the codebase but didn't see any place where unit tests live, if I missed them let me know.

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[codecov[bot]]

Bundle Report

Changes will increase total bundle size by 539 bytes (0.0%) :arrow_up:. This is within the configured threshold :white_check_mark:

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	7.38MB	548 bytes (0.01%) :arrow_up:
sentry-docs-edge-server-array-push	333.11kB	3 bytes (-0.0%) :arrow_down:
sentry-docs-client-array-push	6.44MB	6 bytes (-0.0%) :arrow_down: