feat(ci): Auto-create Stale Component Removal PRs

- Add functionality to the stalness check ci script to create
  component removal PRs if flagged as fully stale

Signed-off-by: Giulio Frasca <gfrasca@redhat.com>

Author: gmfrasca

.github/scripts/create_stale_issues/README.md

@@ -0,0 +1,37 @@
+# Stale Component Handler
+
+Handles components approaching or past their verification deadline.
+
+## What it Does
+
+1. Uses `scripts/check_component_freshness` to categorize components:
+   - 🟡 **Warning (270-360 days)**: Creates GitHub issues to notify owners
+   - 🔴 **Stale (>360 days)**: Creates PRs to remove the component
+
+2. For **warning** components:
+   - Creates issues with `stale-component` label
+   - Assigns component owners (up to 10)
+   - Includes instructions for verification
+
+3. For **stale** components:
+   - Creates a branch `remove-stale-{component-name}`
+   - Removes the component directory
+   - Opens a PR with `stale-component-removal` label
+   - Adds component owners as reviewers
+
+## Usage
+
+```bash
+# Dry run (see what would be created)
+uv run .github/scripts/stale_component_handler/stale_component_handler.py \
+  --repo owner/repo --dry-run
+
+# Create issues and PRs
+GITHUB_TOKEN=ghp_xxx uv run .github/scripts/stale_component_handler/stale_component_handler.py \
+  --repo owner/repo
+```
+
+## Requirements
+
+- `gh` CLI (pre-installed on GitHub Actions runners)
+- `GITHUB_TOKEN` with `issues: write`, `contents: write`, `pull-requests: write` permissions

.github/scripts/create_stale_issues/create_stale_issues.py

@@ -1,6 +1,8 @@
 ## Component Verification Required
 
-The component **{{ name }}** has not been verified in {{ age_days }} days and needs attention.
+The component **{{ name }}** has not been verified in {{ age_days }} days and is approaching the staleness threshold.
+
+**If not verified within the next {{ 360 - age_days }} days, a PR will be created to remove this component.**
 
 | Field                   | Value               |
 |-------------------------|---------------------|

.github/scripts/stale_component_handler/README.md

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+## Stale Component Removal
+
+This PR removes the component **{{ name }}** which has not been verified in {{ age_days }} days.
+
+| Field                   | Value               |
+|-------------------------|---------------------|
+| Path                    | `{{ path }}`        |
+| Last Verified           | {{ last_verified }} |
+| Days Since Verification | {{ age_days }}      |
+
+### Maintainers
+
+{{ owners_mention }}
+
+### Why This PR Was Created
+
+Components must be verified at least once per year to ensure they remain functional and compatible with current KFP versions. This component has exceeded the staleness threshold and no verification was performed.
+
+### Before Merging
+
+If this component should be kept:
+1. Close this PR
+2. Verify the component still works
+3. Update `lastVerified` in `{{ path }}/metadata.yaml`
+4. Submit a PR with the updated metadata
+
+If this component should be removed:
+1. Review the changes
+2. Approve and merge this PR