Add extraObjects and kubecost PR testing workflow

.github/linters/markdownlint.yaml

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+---
+# Default state for all rules
+default: true
+
+# MD013/line-length - Line length
+MD013:
+  # Number of characters
+  line_length: 120
+  # Allow long code blocks
+  code_blocks: false
+  # Allow long tables
+  tables: false
+
+# MD024/no-duplicate-heading - Multiple headings with the same content
+MD024:
+  # Allow different nesting levels to use same heading text
+  allow_different_nesting: true
+
+# MD033/no-inline-html - Inline HTML
+MD033:
+  # Allow specific HTML elements
+  allowed_elements:
+    - br
+    - img
+
+# MD041/first-line-heading - First line in a file should be a top-level heading
+MD041:
+  # Exclude files that are likely to be included in other files
+  exclude:
+    - _*.md
+
+# Made with Bob

.github/linters/yamllint-config.yaml

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+---
+extends: default
+
+rules:
+  # 80 chars should be enough, but don't fail if a line is longer
+  line-length:
+    max: 120
+    level: warning
+
+  # Accept both Unix-style and Windows-style line endings
+  new-line-at-end-of-file: enable
+
+  # Enforce document start with ---
+  document-start:
+    present: true
+
+  # Spaces, not tabs
+  indentation:
+    spaces: 2
+    indent-sequences: consistent
+
+  # No trailing spaces
+  trailing-spaces: enable
+
+  # Ensure consistent empty lines
+  empty-lines:
+    max: 2
+    max-start: 0
+    max-end: 0
+
+  # Enforce key ordering
+  key-ordering: disable
+
+  # Quotes are not required for all strings in YAML
+  quoted-strings:
+    quote-type: any
+    required: only-when-needed
+
+# Made with Bob

.github/workflows/pr-validation.yaml

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+---
+name: PR Validation
+
+on:
+  pull_request
+
+jobs:
+  lint-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
+
+      - name: Set up Helm
+        uses: azure/setup-helm@v4.3.1
+        with:
+          version: ""  # latest version
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.x'
+          check-latest: true
+
+      - name: Set up chart-testing
+        uses: helm/chart-testing-action@v2.7.0
+
+      - name: Run chart-testing (list-changed)
+        id: list-changed
+        run: |
+          changed=$(ct list-changed --target-branch ${{ github.event.repository.default_branch }})
+          if [[ -n "$changed" ]]; then
+            echo "changed=true" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Run chart-testing (lint)
+        if: steps.list-changed.outputs.changed == 'true'
+        run: ct lint --target-branch ${{ github.event.repository.default_branch }}
+
+      - name: Create kind cluster
+        if: steps.list-changed.outputs.changed == 'true'
+        uses: helm/kind-action@v1.12.0
+
+      - name: Run chart-testing (install)
+        if: steps.list-changed.outputs.changed == 'true'
+        run: ct install --target-branch ${{ github.event.repository.default_branch }}
+
+  markdown-lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Lint Markdown files
+        uses: DavidAnson/markdownlint-cli2-action@v13
+        with:
+          globs: '**/*.md'
+          config: '.github/linters/markdownlint.yaml'
+
+  whitespace-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v5
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.x'
+
+      - name: Install yamllint
+        run: pip install yamllint
+
+      - name: Check YAML files with yamllint
+        run: |
+          yamllint -d "{extends: default, rules: {trailing-spaces: {}, document-end: {present: true}}}" charts/
+
+      - name: Check for trailing whitespace in MD and TPL files
+        run: |
+          if grep -r --include="*.md" --include="*.tpl" "[[:blank:]]$" charts/; then
+            echo "Error: Found trailing whitespace in .md or .tpl files"
+            exit 1
+          fi
+
+      - name: Check for missing newlines in MD and TPL files
+        run: |
+          exit_code=0
+          for file in $(find charts/ -type f -name "*.md" -o -name "*.tpl"); do
+            if [ -s "$file" ] && [ "$(tail -c 1 "$file" | wc -l)" -eq 0 ]; then
+              echo "Error: $file does not end with a newline"
+              exit_code=1
+            fi
+          done
+          exit $exit_code