Add: subDomainPrefix as a store config

[beatrizmaselli]

What's the purpose of this pull request?

Add a config to allow replacing other subDomain prefixes for the forwardedHost to be sent.

How it works?

The client configs an array that contains the subDomain prefixes at faststore.config:

  api: {
    storeId: 'storeframework',
    workspace: 'master',
    subDomainPrefix: ['www', 'shop'],
    environment: 'vtexcommercestable',
    hideUnavailableItems: false,
    incrementAddress: true,
  }

With that in case of the host is https://www.vtexfaststore.com we should send .vtexfaststore.com
in case its https://shop.vtexfaststore.com we should send .vtexfaststore.com

How to test it?

Add the subDomainPrefix to the array list and access a domain with the current version and check the host where the checkout cookie was created.

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Name	Status	Preview	Comments	Updated (UTC)
faststore-site	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 20, 2024 0:15am

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[icazevedo]

LGTM