[feature] New ws endpoint for all all Location broadcast

[dee077]

Checklist

• [x] I have read the OpenWISP Contributing Guidelines.
• [x] I have manually tested the changes proposed in this pull request.
• [ ] I have written new test cases for new code and/or updated existing tests for changes to existing code.
• [ ] I have updated the documentation.

Reference to Existing Issue

Closes #1157.

Description of Changes

• Made a new ws endpoint location/all from base django-loci clases with updated user permissions.

Screen Recording

Screencast from 2025-11-13 02-20-06.webm

[coveralls]

coverage: 98.549% (-0.06%) from 98.607% when pulling 5a91a30faae5ec929aafe1047802d24a3f84e369 on feature/1157-new-ws-endpoint-for-all-location into faec934a8f67cde831640b1bbd95cafd3b7269d9 on master.