fix(instance): add support for listing all servers in scaleway_instance_servers data source

[remyleone]

…ce_servers data source

[Copilot]

Pull request overview

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This PR updates the scaleway_instance_servers data source to return the full set of servers (not just the first page) by enabling automatic pagination.

Changes:

• Enable fetching all pages when listing instance servers via the Scaleway SDK.

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 1.99%. Comparing base (2d0bc47) to head (edfa7c9).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/services/instance/servers_data_source.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #4190   +/-   ##
=====================================
  Coverage   1.99%   1.99%           
=====================================
  Files        589     589           
  Lines      67437   67437           
=====================================
  Hits        1346    1346           
  Misses     65991   65991           
  Partials     100     100           

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Creating 51 servers just to test this line does not seem to be appropriate in this context