fix: Correct members count in channels.counters endpoint (closes #35266)

[utkarshh7]

Proposed changes (including videos or screenshots)

• Updated the channels.counters endpoint to fetch the members count from the Subscriptions collection instead of the cached Rooms.usersCount.
• Ensures accurate real-time member counts by querying the source-of-truth data.

Screenshot (API Response):

5 members present in the above image

Issue(s)

Closes #35266

Steps to test or reproduce

1. Create a test channel and add multiple users (including bots/owners).
2. Call the API: curl -H "X-Auth-Token: YOUR_TOKEN" "http://localhost:3000/api/v1/channels.counters?roomId=YOUR_ROOM_ID"
3. Verify members matches the actual count from: curl -H "X-Auth-Token: YOUR_TOKEN" "http://localhost:3000/api/v1/rooms.membersOrderedByRole?roomId=YOUR_ROOM_ID" | jq '.members | length'

##Checklist

• I have read the Contributing Guide.
• I have signed the CLA.
• Lint and unit tests pass locally (yarn lint & yarn test).
• Tests added (not required for this backend fix).
• Documentation not needed (no user-facing changes).

Further comments

• This fix addresses data inconsistency by directly querying the Subscriptions collection, which tracks real-time channel memberships.
• No breaking changes introduced.

[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
• This PR is missing the 'stat: QA assured' label
• This PR is not mergeable
• This PR is targeting the wrong base branch. It should target 7.11.0, but it targets 7.5.0

Please fix the issues and try again

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[utkarshh7]

Maintainers, please look into this PR. This is my first. Thanks in advance!

[Ansh-dS]

haven't remove console.log()