feat(RUM): visit entry to use enterSource facet from distiller

[asthabh23]

Description

This PR contains updates for visit entry checkpoint to use enterSource facet from distiller instead of the default enter.source

Related Issue

#690

How Has This Been Tested?

Tested for both rum and oversight

Screenshots (if appropriate):

Earlier:

Updated:

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

https://main--helix-website--adobe.hlx.live/tools/oversight/explorer.html?domain=emigrationbrewing.com&filter=&view=month&=performance&checkpoint=enter&domainkey=open&conversion.checkpoint=click
vs
https://issue-690--helix-website--adobe.hlx.live/tools/oversight/explorer.html?domain=emigrationbrewing.com&filter=&view=month&=performance&checkpoint=enter&domainkey=open&conversion.checkpoint=click

[aem-code-sync]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed.
In case there are problems, just click a checkbox below to rerun the respective action.

• Re-run PSI checks
• Re-sync branch

Commits

• 08eb44f ✅ (latest)
• 64eb37c ✅
• 579f5ac ✅

[aem-code-sync]

	Page	Scores	Audits	Google
📱	/tools/oversight/explorer.html?domain=emigrationbrewing.com&filter=&view=month&= performance&checkpoint=enter&domainkey=open&conversion.checkpoint=click
🖥️	/tools/oversight/explorer.html?domain=emigrationbrewing.com&filter=&view=month&= performance&checkpoint=enter&domainkey=open&conversion.checkpoint=click

[trieloff]

I think we can do this with more surgical changes. By re-using the enter.source facet name, we don't break the URLs.