feat: SQL server beta and templates refactoring (#32)

## Description

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relates to #1234

## Checklist

- [ ] Issue was linked above
- [ ] Code format was applied: `make fmt`
- [ ] Examples were added / adjusted (see `examples/` directory)
- [x] 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](f5f99d1709/stackit/internal/services/dns/dns_acc_test.go))
- [x] Unit tests are passing: `make test` (will be checked by CI)
- [x] No linter issues: `make lint` (will be checked by CI)

Reviewed-on: #32
Reviewed-by: Andre_Harms <andre.harms@stackit.cloud>
Co-authored-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>
Co-committed-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>

tools/tools.go

@@ -1,9 +1,5 @@
 package tools
 
-// Generate copyright headers
-// nolint:misspell // copywrite is correct here
-//go:generate go run github.com/hashicorp/copywrite headers -d .. --config ../.copywrite.hcl
-
 // Format Terraform code for use in documentation.
 // If you do not have Terraform installed, you can remove the formatting command, but it is suggested
 // to ensure the documentation is formatted properly.