feat: use Scarf Gateway for Superset npm downloads

[arjundevarajan]

SUMMARY

This PR updates the Superset configuration for npm by adding scarf-js as a dependency. This allows Superset maintainers to collect basic de-identified download and adoption metrics. These metrics include which versions of superset are being installed and the origin of installation (git, etc.). This does not have a runtime footprint and adds no additional dependencies beyond itself.

This change was suggested by Superset maintainers in direct discussions. There is also a pull request for updating the Docker compose and helm charts installation methods to retrieve metrics from those pathways.

Scarf purges PII and provides aggregated statistics. Superset users can easily opt out of analytics in various ways documented here and here.

TESTING INSTRUCTIONS

To test this, download Apache Superset using general npm methodology and verify that Apache Superset downloads without issue.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• [ x ] Introduces new feature or API
• Removes existing feature or API

[rusackas]

Adding a note here that docs are added on the related PR: #24432

[codecov]

Codecov Report

Merging #24433 (adf32b2) into master (837e3c5) will not change coverage.
The diff coverage is n/a.

❗ Current head adf32b2 differs from pull request most recent head debe99b. Consider uploading reports for the commit debe99b to get more accurate results

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  Hits        50932    50932           
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javascript	55.71% <ø> (ø)

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