Default to new encoder for Gladys Gateway payload

[Pierre-Gilles]

Pull Request check-list

To ensure your Pull Request can be accepted as fast as possible, make sure to review and check all of these items:

• If your changes affects code, did your write the tests?
• Are tests passing? (npm test on both front/server)
• Is the linter passing? (npm run eslint on both front/server)
• Did you run prettier? (npm run prettier on both front/server)
• If you are adding a new features/services, did you run integration comparator? (npm run compare-translations on front)
• Did you test this pull request in real life? With real devices? If this development is a big feature or a new service, we recommend that you provide a Docker image to the community for testing before merging.
• If your changes modify the API (REST or Node.js), did you modify the API documentation? (Documentation is based on comments in code)
• If you are adding a new features/services which needs explanation, did you modify the user documentation? See the GitHub repo and the website.
• Did you add fake requests data for the demo mode (front/src/config/demo.js) so that the demo website is working without a backend? (if needed) See https://demo.gladysassistant.com.

NOTE: these things are not required to open a PR and can be done afterwards / while the PR is open.

Description of change

Please provide a description of the change here. It's always best with screenshots, so don't hesitate to add some!

[relativeci]

Job #263: Bundle Size — 6.73MB (0%).

937a82a vs 1171225

Changed metrics (1/10)

Metric	Current	Baseline
Cache Invalidation	43.24%	0%

Changed assets by type (0/7)

No changes

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View Job #263 report on app.relative-ci.com

[codecov]

Codecov Report

Merging #1491 (92d93ab) into master (1171225) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1491   +/-   ##
=======================================
  Coverage   96.59%   96.59%           
=======================================
  Files         616      616           
  Lines        8898     8898           
=======================================
  Hits         8595     8595           
  Misses        303      303           

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