chore(serverbackup): switch to new sdk structure

[rubenhoenle]

Description

relates to STACKITCLI-354

Checklist

• Issue was linked above
• Code format was applied: make fmt
• Examples were added / adjusted (see e.g. here)
• Docs are up-to-date: make generate-docs (will be checked by CI)
• Unit tests got implemented or updated
• 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 changes the coverage (1 decrease, 1 increase)

Impacted Packages	Coverage Δ	🤖
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/create	46.94% (ø)
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/delete	46.88% (ø)
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/describe	74.55% (+0.96%)	👍
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/disable	31.82% (ø)
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/enable	37.50% (ø)
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/list	56.36% (-1.53%)	👎
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/restore	55.26% (ø)
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/schedule/create	50.00% (ø)
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/schedule/delete	38.46% (ø)
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/schedule/describe	72.92% (ø)
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/schedule/list	61.67% (ø)
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/schedule/update	62.71% (ø)
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/volume-backup/delete	48.48% (ø)
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/volume-backup/restore	52.78% (ø)
github.com/stackitcloud/stackit-cli/internal/pkg/services/serverbackup/client	0.00% (ø)
github.com/stackitcloud/stackit-cli/internal/pkg/services/serverbackup/utils	90.91% (ø)

---

Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/create/create.go	46.94% (ø)	49	23	26
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/delete/delete.go	46.88% (ø)	32	15	17
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/describe/describe.go	74.55% (+0.96%)	55 (+2)	41 (+2)	14	👍
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/disable/disable.go	31.82% (ø)	44	14	30
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/enable/enable.go	37.50% (ø)	40	15	25
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/list/list.go	56.36% (-1.53%)	55 (-2)	31 (-2)	24	👎
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/restore/restore.go	55.26% (ø)	38	21	17
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/schedule/create/create.go	50.00% (ø)	52	26	26
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/schedule/delete/delete.go	38.46% (ø)	39	15	24
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/schedule/describe/describe.go	72.92% (ø)	48	35	13
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/schedule/list/list.go	61.67% (ø)	60	37	23
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/schedule/update/update.go	62.71% (ø)	59	37	22
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/volume-backup/delete/delete.go	48.48% (ø)	33	16	17
github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/volume-backup/restore/restore.go	52.78% (ø)	36	19	17
github.com/stackitcloud/stackit-cli/internal/pkg/services/serverbackup/client/client.go	0.00% (ø)	1	0	1
github.com/stackitcloud/stackit-cli/internal/pkg/services/serverbackup/utils/utils.go	90.91% (ø)	11	10	1

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/stackit-cli/internal/cmd/server/backup/create/create_test.go
• github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/delete/delete_test.go
• github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/describe/describe_test.go
• github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/disable/disable_test.go
• github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/enable/enable_test.go
• github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/list/list_test.go
• github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/restore/restore_test.go
• github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/schedule/create/create_test.go
• github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/schedule/delete/delete_test.go
• github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/schedule/describe/describe_test.go
• github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/schedule/list/list_test.go
• github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/schedule/update/update_test.go
• github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/volume-backup/delete/delete_test.go
• github.com/stackitcloud/stackit-cli/internal/cmd/server/backup/volume-backup/restore/restore_test.go
• github.com/stackitcloud/stackit-cli/internal/pkg/services/serverbackup/utils/utils_test.go