Add nightly job to purge old messages

[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 (french forum/english forum) for testing before merging.
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• 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

Purge old messages that are useless

[cloudflare-workers-and-pages]

Deploying gladys-plus with    Cloudflare Pages

Latest commit:	75c2582
Status:	✅  Deploy successful!
Preview URL:	https://f48f7737.gladys-plus.pages.dev
Branch Preview URL:	https://add-message-purge-job.gladys-plus.pages.dev

View logs

[relativeci]

#2725 Bundle Size — 10.19MiB (~+0.01%).

75c2582(current) vs 344b601 master#2707(baseline)

Warning

Bundle contains 3 duplicate packages – View duplicate packages

Bundle metrics   2 changes 1 regression

	Current #2725	Baseline #2707
Initial JS	5.5MiB(~+0.01%)	5.5MiB
Initial CSS	303.12KiB	303.12KiB
Cache Invalidation	53.84%	0%
Chunks	51	51
Assets	171	171
Modules	1490	1490
Duplicate Modules	21	21
Duplicate Code	0.83%	0.83%
Packages	124	124
Duplicate Packages	3	3

Bundle size by type   1 change 1 regression

	Current #2725	Baseline #2707
JS	7.28MiB (~+0.01%)	7.28MiB
IMG	2.48MiB	2.48MiB
CSS	319.91KiB	319.91KiB
Fonts	93.55KiB	93.55KiB
Other	17.62KiB	17.62KiB
HTML	13.58KiB	13.58KiB

Bundle analysis report Branch add-message-purge-job Project dashboard

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.48%. Comparing base (344b601) to head (75c2582).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2119   +/-   ##
=======================================
  Coverage   98.48%   98.48%           
=======================================
  Files         866      867    +1     
  Lines       14158    14171   +13     
=======================================
+ Hits        13943    13956   +13     
  Misses        215      215           

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