CDPCP-12516 - clean up unused functions prior implementing dead code check

[gregito]

Depends on #143

[github-actions]

Go test coverage: 31.9% for commit 43feecd

⚠️ 2 of 13 packages have zero coverage.

• github.com/cloudera/terraform-provider-cdp/resources/de
• github.com/cloudera/terraform-provider-cdp/resources/ml

View coverage for all packages

# Package Name                                                        | Coverage
+ github.com/cloudera/terraform-provider-cdp/cdpacctest               |    26.9%
+ github.com/cloudera/terraform-provider-cdp/provider                 |    78.7%
+ github.com/cloudera/terraform-provider-cdp/resources/datahub        |    36.5%
+ github.com/cloudera/terraform-provider-cdp/resources/datalake       |     7.7%
- github.com/cloudera/terraform-provider-cdp/resources/de             |     0.0%
+ github.com/cloudera/terraform-provider-cdp/resources/dw             |    83.3%
+ github.com/cloudera/terraform-provider-cdp/resources/dw/cluster/aws |    78.6%
+ github.com/cloudera/terraform-provider-cdp/resources/environments   |    45.8%
+ github.com/cloudera/terraform-provider-cdp/resources/iam            |     1.9%
- github.com/cloudera/terraform-provider-cdp/resources/ml             |     0.0%
+ github.com/cloudera/terraform-provider-cdp/resources/opdb           |    25.3%
+ github.com/cloudera/terraform-provider-cdp/utils                    |    51.3%
+ github.com/cloudera/terraform-provider-cdp/utils/test               |    68.8%