feat: adding unit tests for calendar modal and caption component

[reachaadrika]

Description

• This PR includes tests for 3 components : Calendar , Modal and Caption . These are standalone files in the component folder itself.

• Calendar , component here , renders the list of meetings / events scheduled , along with a link to Google Calendar button . The tests that I have included here are as follows :

1. renders the upcoming events
2. renders the "View Calendar" button if events exist
3. renders the "No meetings scheduled" message if no events exist
   

• Caption , component here renders a small caption and children or the content to be entered here is passed as props .
  The tests that I have included here are as follows :

1. renders the caption text correctly
2. check correct CSS classes
   

-Modal , this is the modal component , tests that I have included for this component are as follows .
1 . should call onModalClose when the close button is clicked
2. should call onModalClose when the backdrop is clicked
3. should call onModalClose when the Escape key is pressed

NOTE : In this cypress doesn't provide functionality to exactly interact with the components , thus I have created a simulation for these actions in test window .

Related issue(s)
fixes #1810

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[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🔴 Performance	45
🟢 Accessibility	98
🟢 Best practices	100
🟢 SEO	100
🔴 PWA	30

Lighthouse ran on https://deploy-preview-1811--asyncapi-website.netlify.app/

[reachaadrika]

/rtm