chore: refactor promtail extraScrapeConfigs into scrapeConfigs (#367)

## Description
Move the `extraScrapeConfig` snippets into the `snippets.scrapeConfigs`
and copy/paste the upstream default `scrapeConfig`. This will allow for
adding `extraScrapeConfigs` at deploy time via overrides without needing
to copy over the default configs provided by core.

## Related Issue
is part of completing this PR
defenseunicorns/uds-infrastructure#105

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [x] Other (security config, docs update, etc)

## Checklist before merging

- [ ] Test, docs, adr added or updated as needed
- [ ] [Contributor Guide
Steps](https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md)(https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md#submitting-a-pull-request)
followed

Author: TristanHoladay

src/promtail/values/values.yaml

@@ -3,7 +3,49 @@ config:
     - url: 'http://loki-gateway.loki.svc.cluster.local:80/loki/api/v1/push'
 
   snippets:
-    extraScrapeConfigs: >
+    scrapeConfigs: |
+      # Upstream Defaults https://github.com/grafana/helm-charts/blob/main/charts/promtail/values.yaml
+      # See also https://github.com/grafana/loki/blob/master/production/ksonnet/promtail/scrape_config.libsonnet for reference
+      - job_name: kubernetes-pods
+        pipeline_stages:
+          {{- toYaml .Values.config.snippets.pipelineStages | nindent 4 }}
+        kubernetes_sd_configs:
+          - role: pod
+        relabel_configs:
+          - source_labels:
+              - __meta_kubernetes_pod_controller_name
+            regex: ([0-9a-z-.]+?)(-[0-9a-f]{8,10})?
+            action: replace
+            target_label: __tmp_controller_name
+          - source_labels:
+              - __meta_kubernetes_pod_label_app_kubernetes_io_name
+              - __meta_kubernetes_pod_label_app
+              - __tmp_controller_name
+              - __meta_kubernetes_pod_name
+            regex: ^;*([^;]+)(;.*)?$
+            action: replace
+            target_label: app
+          - source_labels:
+              - __meta_kubernetes_pod_label_app_kubernetes_io_instance
+              - __meta_kubernetes_pod_label_instance
+            regex: ^;*([^;]+)(;.*)?$
+            action: replace
+            target_label: instance
+          - source_labels:
+              - __meta_kubernetes_pod_label_app_kubernetes_io_component
+              - __meta_kubernetes_pod_label_component
+            regex: ^;*([^;]+)(;.*)?$
+            action: replace
+            target_label: component
+          {{- if .Values.config.snippets.addScrapeJobLabel }}
+          - replacement: kubernetes-pods
+            target_label: scrape_job
+          {{- end }}
+          {{- toYaml .Values.config.snippets.common | nindent 4 }}
+          {{- with .Values.config.snippets.extraRelabelConfigs }}
+          {{- toYaml . | nindent 4 }}
+          {{- end }}
+      # UDS CORE Defaults
       - job_name: systemd-messages
         static_configs:
           - targets: [localhost]
@@ -21,6 +63,13 @@ config:
           - source_labels:
             - __journal_syslog_identifier
             target_label: syslog_identifier
+      - job_name: kubernetes-logs
+        static_configs:
+          - targets: [localhost]
+            labels:
+              job: kubernetes-logs
+              host: "${NODE_HOSTNAME}"
+              __path__: /var/log/kubernetes/**/*.log
 
 containerSecurityContext:
   allowPrivilegeEscalation: false