chore: Add tmid field in the ChatPostMessage request body schema

[ahmed-n-abdeltwab]

Proposed changes

Add the tmid attribute to the ChatPostMessage channel request body schema to resolve the Python SDK issue when posting messages using tmid.

Issue(s)

Relates to #35923;

Looking forward to your feedback! 🚀

Summary by CodeRabbit

Release Notes

• Tests

  • Added end-to-end tests for threaded message reply functionality

• New Features

  • Message posting API now supports threaded replies, enabling messages to link to parent messages through an optional parameter

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[dionisio-bot]

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Latest commit: 1848c2f

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.85%. Comparing base (9e92b49) to head (1848c2f).
⚠️ Report is 361 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #36093      +/-   ##
===========================================
- Coverage    70.86%   70.85%   -0.02%     
===========================================
  Files         3160     3160              
  Lines       109775   109775              
  Branches     19709    19707       -2     
===========================================
- Hits         77795    77777      -18     
- Misses       29957    29969      +12     
- Partials      2023     2029       +6     

Flag	Coverage Δ
e2e	60.34% <ø> (+0.01%)	⬆️
e2e-api	47.85% <ø> (-1.06%)	⬇️
unit	72.06% <ø> (+0.01%)	⬆️

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All committers have signed the CLA.

[ahmed-n-abdeltwab]

The tmid field is described in the documentation as The ID of the thread to which the message belongs. I think it's more logical for the roomID to be require when using tmid

[coderabbitai]

Walkthrough

This pull request extends the Chat API to support threaded replies via the tmid (thread message ID) parameter and adds end-to-end tests validating the threaded reply functionality. The type definitions have been updated to accept tmid in the postMessage payload, and two comprehensive test cases verify the feature works correctly across different room creation methods.

Changes

Cohort / File(s)	Summary
Type Definitions packages/rest-typings/src/v1/chat.ts	Extended ChatPostMessage union type with optional tmid?: string field and corresponding schema update for the roomId-based payload variant.
End-to-End Tests apps/meteor/tests/end-to-end/api/chat.ts	Added two threaded reply tests: one using channel creation and another using room creation. Both verify that posting a message with tmid correctly links it to the parent message and that retrieval confirms the thread linkage.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 Threaded replies now bloom,
Tests hop through each room,
tmid links messages true,
Conversations branch anew! 🌿

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding the tmid field to the ChatPostMessage request body schema, which is reflected in both the typings and test files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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