feat: endpoint to fetch distinct values for apps logs filter

[d-gubert]

Proposed changes (including videos or screenshots)

Add the endpoint /api/apps/:id/logs/distinctValues that returns an array of the distinct values of the instanceId and method fields found in the logs collection.

This will assist filtering UI capabilities

Issue(s)

Steps to test or reproduce

Further comments

ALT-21
ALT-25

Not adding a changeset file as this is mainly a complement for #36288

Will need to document the "deprecated" indexes until we're able to delete them with a migration on 8.0

[dionisio-bot]

Looks like this PR is ready to merge! 🎉
If you have any trouble, please check the PR guidelines

[changeset-bot]

⚠️ No Changeset found

Latest commit: a349664

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[d-gubert]

I'm pondering whether to add a changeset for this one. The main purpose of the endpoint is to assist the UI with pre-populated filtering data, there is not much use beyond that - thus my doubt if it deserves to be in the changeset by itself, or if we leave the changeset to be added by the filters PR

[github-actions]

PR Preview Action v1.6.2
🚀 View preview at https://RocketChat.github.io/Rocket.Chat/pr-preview/pr-36245/
Built to branch gh-pages at 2025-07-18 13:07 UTC. Preview will be ready when the GitHub Pages deployment is complete.

[codecov]

Codecov Report

Attention: Patch coverage is 96.10390% with 3 lines in your changes missing coverage. Please review.

Project coverage is 65.71%. Comparing base (415d7c3) to head (a349664).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #36245      +/-   ##
===========================================
+ Coverage    65.69%   65.71%   +0.02%     
===========================================
  Files         3171     3173       +2     
  Lines       105625   105659      +34     
  Branches     20057    20066       +9     
===========================================
+ Hits         69386    69433      +47     
+ Misses       33562    33547      -15     
- Partials      2677     2679       +2     

Flag	Coverage Δ
e2e	58.18% <17.39%> (+0.01%)	⬆️
unit	70.84% <96.10%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[ggazzo]

approving in respect to the approvals of my friends who are enjoying their well-deserved rest