feat(iaas): support description field for network and network area cmds

[cgoetz-inovex]

Description

relates to #1234

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 will increase overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/stackitcloud/stackit-cli/internal/cmd/network-area/route/list	56.92% (ø)
github.com/stackitcloud/stackit-cli/internal/cmd/network-area/routingtable/route/create	64.38% (ø)
github.com/stackitcloud/stackit-cli/internal/cmd/network/create	68.81% (+0.29%)	👍
github.com/stackitcloud/stackit-cli/internal/cmd/network/describe	56.99% (+0.95%)	👍
github.com/stackitcloud/stackit-cli/internal/cmd/network/list	60.00% (ø)
github.com/stackitcloud/stackit-cli/internal/cmd/network/update	53.95% (+1.89%)	👍
github.com/stackitcloud/stackit-cli/internal/pkg/services/iaas/utils	85.45% (ø)
github.com/stackitcloud/stackit-cli/internal/pkg/services/network-area/routing-table/utils	100.00% (ø)

Coverage details

_{Compared to commit f020712 (run #38869506465)}

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/stackitcloud/stackit-cli/internal/cmd/network-area/route/list/list.go	56.92% (ø)	65	37	28
github.com/stackitcloud/stackit-cli/internal/cmd/network-area/routingtable/route/create/create.go	64.38% (ø)	73	47	26
github.com/stackitcloud/stackit-cli/internal/cmd/network/create/create.go	68.81% (+0.29%)	109 (+1)	75 (+1)	34	👍
github.com/stackitcloud/stackit-cli/internal/cmd/network/describe/describe.go	56.99% (+0.95%)	93 (+2)	53 (+2)	40	👍
github.com/stackitcloud/stackit-cli/internal/cmd/network/list/list.go	60.00% (ø)	55	33	22
github.com/stackitcloud/stackit-cli/internal/cmd/network/update/update.go	53.95% (+1.89%)	76 (+3)	41 (+3)	35	👍
github.com/stackitcloud/stackit-cli/internal/pkg/services/iaas/utils/utils.go	85.45% (ø)	110	94	16
github.com/stackitcloud/stackit-cli/internal/pkg/services/network-area/routing-table/utils/utils.go	100.00% (ø)	27	27	0

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/network/create/create_test.go
• github.com/stackitcloud/stackit-cli/internal/cmd/network/update/update_test.go