example: remove duplicate items in .dockerignore (#91079)

Removed duplicate entries for cache and temporary directories.

```diff
- # Cache directories and temporary data
- .cache/
- .parcel-cache/
- .eslintcache
- .stylelintcache
- .turbo/
- .tmp/
# Cache directories and temporary data
.cache/
.parcel-cache/
.eslintcache
.stylelintcache
.swc/
.turbo/
.tmp/
.temp/
```

Co-authored-by: Joseph <joseph.chamochumbi@vercel.com>

Author: kowyo

examples/with-docker/.dockerignore

@@ -75,13 +75,6 @@ docs/
 .circleci/
 Jenkinsfile
 
-# Cache directories and temporary data
-.cache/
-.parcel-cache/
-.eslintcache
-.stylelintcache
-.turbo/
-.tmp/
 # Cache directories and temporary data
 .cache/
 .parcel-cache/