Bug fix: Render actions fail when non Helm values yamls are present in the examples directory

[jvoravong]

Description:

• I would like to create examples in this project that contain yaml files that are not Helm values files.
• The "make render" command reads all yaml files in our examples and will throw an error if it can't render the yaml file. In this PR I make it so only yaml files ending in "values.yaml" are rendered.
• Some of our example Helm values yaml files needed to be renamed to accommodate this change.