fix(website): prevent duplicate startTracking causing rudderQueue error

[tolzhabayev]

Guard startTracking with a module-level initialized flag so route changes and React strict-mode double-effects do not append a second rudderstack script, whose onload would iterate an already-drained (undefined) rudderQueue and throw TypeError: rudderQueue is not iterable.

@Ukochka — does this look right to you? If so, would you be up for porting the same fix to the other Grafana sub-sites that share this tracking module?

[github-actions]

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[Copilot]

Pull request overview

This PR fixes a production runtime error in the Docusaurus website tracking integration by preventing startTracking() from running more than once per module load. This avoids appending the RudderStack SDK script multiple times (e.g., via route changes and React strict-mode double effects), which previously could cause the SDK onload handler to iterate an already-drained rudderQueue and throw TypeError: rudderQueue is not iterable.

Changes:

• Add a module-level trackingInitialized flag.
• Guard startTracking() so it becomes a one-time initializer when shouldTrack is true.