yaml/v2: apply the namespace uniformly to the resource name

[EronWright]

Proposed changes

This PR strengthens the normalization of the parsed Kubernetes objects to better interoperate with #2881.
Specifically:

1. Applies the default namespace as necessary on each object, so that they may be reliably targeted by the depends-on resource.
2. Stabilizes the resource id (e.g. default/my-map versus my-map).
3. Validates that the objects are well-formed more eagerly than during Register.

For example, given the below manifest and assuming that the default namespace is default, we would expect a DependsOn option from Certificate to Issuer. Observe that namespace isn't explicitly set on the issuer.

name: issue-2870-cert-manager
runtime: yaml
resources:
  example:
    type: kubernetes:yaml/v2:ConfigGroup
    properties:
      yaml: |
        apiVersion: cert-manager.io/v1
        kind: Issuer
        metadata:
          name: test-selfsigned
        spec:
          selfSigned: {}
        ---
        apiVersion: cert-manager.io/v1
        kind: Certificate
        metadata:
          name: selfsigned-cert
          annotations:
            config.kubernetes.io/depends-on: cert-manager.io/namespaces/default/Issuer/test-selfsigned
        spec:
          dnsNames:
            - example.com
          secretName: selfsigned-cert-tls
          issuerRef:
            name: test-selfsigned

To apply the default namespace correctly, one must know whether a given kind is namespace-scoped. The provider naturally uses the discovery client, and also looks for a matching CRD amongst the parsed objects (since they're not yet installed).

Testing

New test cases were added for Normalize, and some test cases were moved from Register because the validation is performed more eagerly.

New sub-tests were added for IsNamespacedKind to cover the local CRD enhancement.

Related issues (optional)

Closes #2870

[rquitales]

LGTM with 1 minor non-blocking feedback.

[github-actions]

Does the PR have any schema changes?

Looking good! No breaking changes found.
No new resources/functions.

[codecov]

Codecov Report

Attention: Patch coverage is 87.30159% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 27.55%. Comparing base (e006410) to head (490d06e).

Files	Patch %	Lines
provider/pkg/provider/yaml/v2/yaml.go	85.71%	2 Missing and 2 partials ⚠️
provider/pkg/provider/yaml/v2/configfile.go	66.66%	1 Missing and 1 partial ⚠️
provider/pkg/provider/yaml/v2/configgroup.go	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2897      +/-   ##
==========================================
+ Coverage   27.19%   27.55%   +0.35%     
==========================================
  Files          53       53              
  Lines        7780     7818      +38     
==========================================
+ Hits         2116     2154      +38     
+ Misses       5486     5485       -1     
- Partials      178      179       +1     

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[EronWright]

Unfortunately there's a problem with this, in preview mode, the CRDs aren't actually installed and this breaks multi-CG use cases. The solution will either be to eat the error in preview mode, or to somehow resolve the CRDs across components. A follow-up PR:
#2904