feat: Apps-Engine services

[d-gubert]

Proposed changes (including videos or screenshots)

We're extracting the service creation from PR #27024 in worder to facilitate reviews and discussions.

Here we're just introducing the new services; the adoption of those services is mostly intended to change in future PRs

Issue(s)

Steps to test or reproduce

Further comments

AECO-119

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.43%. Comparing base (6bcdd88) to head (fccb9cf).
Report is 2122 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #28964      +/-   ##
===========================================
- Coverage    48.51%   48.43%   -0.08%     
===========================================
  Files          697      697              
  Lines        13913    13913              
  Branches      2447     2447              
===========================================
- Hits          6750     6739      -11     
- Misses        6787     6792       +5     
- Partials       376      382       +6     

Flag	Coverage Δ
e2e	46.53% <ø> (-0.08%)	⬇️
unit	64.90% <ø> (ø)

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[pierre-lehnen-rc]

What's the criteria for splitting something into a separate service or not?
I'm just curious why the videoconf methods are on their own service, but the slash commands stuff remain on the AppManager.

[dionisio-bot]

Looks like this PR is not ready to merge, because of the following issues:

• This PR has conflicts, please resolve them before merging
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1 out of 2 committers have signed the CLA.

✅ d-gubert
❌ Rafael Tapia

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