* build: Generate test data for unsigned and no provenance image indexes
* feat: Add function to build index without SBOM or provenance for linux/amd64 platform
* feat: add build_image function to build image without SBOM or provenance for linux/amd64
* feat: Rename NO_SBOM_NO_PROVENANCE_INDEX_DIR to UNSIGNED_IMAGE_DIR
* feat: support images in details resolvers
This gets rid of those annoying logs like:
```
time="2024-09-11T15:22:04Z" level=error msg="Error parsing the serverURL" error="docker-credential-ecr-login can only be used with Amazon Elastic Container Registry." serverURL="localhost:5000"
time="2024-09-11T15:22:04Z" level=error msg="Error parsing the serverURL" error="docker-credential-ecr-login can only be used with Amazon Elastic Container Registry." serverURL="localhost:5000"
time="2024-09-11T15:22:04Z" level=error msg="Error parsing the serverURL" error="docker-credential-ecr-login can only be used with Amazon Elastic Container Registry." serverURL="localhost:5000"
time="2024-09-11T15:22:04Z" level=error msg="Error parsing the serverURL" error="docker-credential-ecr-login can only be used with Amazon Elastic Container Registry." serverURL="localhost:5000"
```
* feature!: support for setting HTTP User-Agent header
* fix lint
* fix e2e
* refactor: move http.go to internal/util/useragent package and rename functions to Get and Set
* Move packages and use attest version
