MessageToolBox dropdown UX improvement

Description:

The message toolbox dropdown gets shrink when you view the options for the last few messages.

Steps to reproduce:

1. Go to any chat
2. Click on three dots for the bottom few messages on screen to view message options
3. You will notice that the drop down is scrollable but shrink

Expected behavior:

In the case of bottom few messages on screen, the message options should be a DropUp depending upon the space between the message and the message Box.

Actual behavior:

This is the current behavior, but its ambiguous.
Sometimes it works as expected, but mostly it does not.

Server Setup Information:

• Version of Rocket.Chat Server: 6.0.0
• Operating System: MacOS
• Deployment Method: yarn dsv
• Number of Running Instances: 1
• NodeJS Version: 14.21.2

Client Setup Information

• Desktop App or Browser Version: Firefox 111.0 (64-bit)
• Operating System: MacOS

Start by reproducing the issue in a chat and opening the message toolbox on messages near the bottom of the viewport. Trace the message toolbox dropdown entry point and its positioning behavior; done means the options open upward when there is insufficient space below and remain usable without unintended shrinking.