message: clarify when cache key should be bumped
diff: @@ -196,12 +196,13 @@ import {
  } from '@backstage/plugin-catalog-backend';
  import { CatalogProcessorParser } from '.';
  -// Change this key to if the processor has undergone major changes
  -// and the existing cache data is no longer compatible.
  +// It's recommended to always bump the CACHE_KEY version if you make
  +// changes to the processor implementation or CacheItem.
  const CACHE_KEY = 'v1';
  // CacheItem is our cache containing ETag used in the upstream request
  // as well as the processing result used when the Etag matches.
  +// Bump the CACHE_KEY version if you make any changes to this type.
  type CacheItem = {
  etag: string;
  entity: Entity;
  