chore: Remove product-config and product_config_utils

[siegfriedweber]

Description

Remove the dependency to product-config and the product_config_utils module.

In the operators, product_config must be removed from RunArguments.

Part of stackabletech/issues#870

Definition of Done Checklist

• Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant
• Please make sure all these things are done and tick the boxes

Author

Reviewer

• Code contains useful comments
• Code contains useful logging statements
• (Integration-)Test cases added
• Documentation added or updated. Follows the style guide.
• Changelog updated
• Cargo.toml only contains references to git tags (not specific commits or branches)

Acceptance

• Feature Tracker has been updated
• Proper release label has been added

[maltesander]

Some greps still show product config references (care some false positives):

grep -r "product config" .
./crates/stackable-operator/src/config_overrides.rs:/// Trait that allows the product config pipeline to extract flat key-value
./crates/stackable-operator/src/config_overrides.rs:    /// the format expected by the product config pipeline.
./crates/stackable-operator/src/role_utils.rs:    /// The `configOverrides` can be used to configure properties in product config files
./crates/stackable-operator/src/crd/authentication/oidc/mod.rs:    /// OIDC specific config options. These are set on the product config level.
./crates/stackable-operator/src/config/mod.rs://! - Apply `#[derive(Fragment)] #[fragment_attrs(derive(Merge))]` for your product configuration (and any of its nested types).
./crates/stackable-operator/src/config/fragment.rs://! Fragments are partially validated parts of a product configuration. For example, mandatory values may be missing.
./crates/stackable-operator/crds/DummyCluster.yaml:                      The `configOverrides` can be used to configure properties in product config files
./crates/stackable-operator/crds/DummyCluster.yaml:                            The `configOverrides` can be used to configure properties in product config files

and

grep -r "product_config" .
./crates/stackable-operator/src/config_overrides.rs:    pub fn as_product_config_overrides(&self) -> BTreeMap<String, Option<String>> {
./crates/stackable-operator/src/config_overrides.rs:    fn key_value_config_overrides_as_product_config_overrides() {
./crates/stackable-operator/src/config_overrides.rs:        let result = kv.as_product_config_overrides();

Some are only changelog related etc.

[siegfriedweber]

The product config is still referenced in crates/stackable-operator/src/config_overrides.rs. Rather than adapting this file, I'd prefer to remove all modules that are superseded by their v2 counterparts in a follow-up pull request.

[maltesander]

LGTM!