Clean device feature state in small chunks to prevent Gladys from being stuck

[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

Cleaning device feature states is now a background job

[relativeci]

Job #497: Bundle Size — 7.02MB (~+0.01%).

7b0ac1c vs 505df71

Changed metrics (2/10)

Metric	Current	Baseline
Initial JS	2.98MB(+0.02%)	2.98MB
Cache Invalidation	42.29%	0%

Changed assets by type (1/7)

	Current	Baseline
JS	4.99MB (+0.01%)	4.98MB

---

View Job #497 full report

[codecov]

Codecov Report

Base: 96.77% // Head: 96.73% // Decreases project coverage by -0.03% ⚠️

Coverage data is based on head (65ba936) compared to base (505df71).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1610      +/-   ##
==========================================
- Coverage   96.77%   96.73%   -0.04%     
==========================================
  Files         654      647       -7     
  Lines        9662     9367     -295     
==========================================
- Hits         9350     9061     -289     
+ Misses        312      306       -6     

Impacted Files	Coverage Δ
server/lib/device/device.create.js	98.59% <100.00%> (-0.08%)	⬇️
server/lib/device/device.purgeStatesByFeatureId.js	100.00% <100.00%> (ø)
server/lib/job/job.wrapper.js	100.00% <100.00%> (ø)
server/lib/device/index.js
server/utils/constants.js
server/utils/slugify.js
server/lib/http/index.js
server/utils/device.js
server/lib/index.js
server/models/device.js
... and 1 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.