Fix hardcoded suma tree url

[lcaparroz]

Description

Fix bug that hardcoded the SUMA product tree URL to 'scc.suse.com' even if a different host was specified in the RMT configuration file.

• Related Issue / Ticket / Trello card: https://bugzilla.suse.com/show_bug.cgi?id=1234844

How to test

1. Edit config/rmt.local.yml and change scc.host to point to a different host than https://scc.suse.com/connect, e.g.: http://localhost:3000/connect

2. On the project root directory, run bin/rmt-cli mirror --debug. If the command succeeds in downloading the SUMA product tree, it should print a similar output:

   I, [2025-01-03T12:19:11.738742 #1623]  INFO -- : Mirroring SUSE Manager product tree to <...>/rmt/public/suma/
   D, [2025-01-03T12:19:11.741255 #1623] DEBUG -- : HTTP request for: http://localhost:3000/suma/product_tree.json
   I, [2025-01-03T12:19:13.112999 #1623]  INFO -- : ↓ product_tree.json
   D, [2025-01-03T12:19:13.113127 #1623] DEBUG -- :   (new mtime: 2025-01-03 11:19:13 UTC)
   

3. Verify that the output shows the SUMA product tree is downloaded from the same host as specified in the RMT configuraion file.

Change Type

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• Bug Fix (a non-breaking change which fixes an issue)
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• Documentation Update (a change which only updates documentation)

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• I have reviewed my own code and believe that it's ready for an external review.
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• I have documented the MANUAL.md file with any changes to the user experience.
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