[Task] Add unit test cases for BotMessage component

Task Description: Currently, we run unit tests using jest which can be found here.

However, the test cases are not yet comprehensive enough and work can be done to cover more grounds. Specifically for this issue, we hope to add test cases for the BotMessage component.

Deliverable(s): New unit test cases that cover the testing of the BotMessage component.

Additional Context:

• The BotMessage components can be found here
• An example for AudioButton can be found here which may serve as a good source for reference

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