Add required scopes to hubspot.md docs

[htrueman]

What

Closes #3011

How

Update hubspot.md with stream - required scope mappings.

Recommended reading order

1. hubspot.md

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[htrueman]

Should be merged after the #6465

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[sherifnada]

could you merge this into the Hubspot oauth PR, since those should ship together?

[htrueman]

PR is merged to #6465. Comment suggestions applied.