chore(sfs): switch to new SDK structure

[s-inter]

Description

relates to STACKITTPR-578

Checklist

• Issue was linked above
• Code format was applied: make fmt
• Examples were added / adjusted (see examples/ directory)
• Docs are up-to-date: make generate-docs (will be checked by CI)
• Unit tests got implemented or updated
• Acceptance tests got implemented or updated (see e.g. here)
• Unit tests are passing: make test (will be checked by CI)
• No linter issues: make lint (will be checked by CI)

[github-actions]

Merging this branch will not change overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs	0.00% (ø)
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/export-policy	18.79% (ø)
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/resourcepool	19.27% (ø)
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/share	11.39% (ø)
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/snapshots	28.95% (ø)
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/utils	75.00% (ø)

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Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/export-policy/datasource.go	0.00% (ø)	47	0	47
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/export-policy/resource.go	22.55% (ø)	235	53	182
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/resourcepool/datasource.go	31.08% (ø)	74	23	51
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/resourcepool/resource.go	15.42% (ø)	227	35	192
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/share/datasource.go	21.21% (ø)	66	14	52
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/share/resource.go	8.37% (ø)	215	18	197
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/snapshots/datasource.go	28.95% (ø)	76	22	54
github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/utils/util.go	75.00% (ø)	8	6	2

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.

Changed unit test files

• github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/export-policy/resource_test.go
• github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/resourcepool/datasource_test.go
• github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/resourcepool/resource_test.go
• github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/sfs_acc_test.go
• github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/share/datasource_test.go
• github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/share/resource_test.go
• github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/snapshots/datasource_test.go
• github.com/stackitcloud/terraform-provider-stackit/stackit/internal/services/sfs/utils/util_test.go