Upgrade to Node 20 (LTS)

[palisadoes]

Is your feature request related to a problem? Please describe.

1. We need to ensure that the app runs on an LTS version of Node.js
   1. https://nodejs.org/en/about/previous-releases
2. The installation guide doesn't specify the required LTS version of Node.js to be used
3. The application needs to be tested to make sure that it works with an LTS version of Node.js
4. Our GitHub Actions need to be updated to specify the LTS version of Node.js to be used

Describe the solution you'd like

1. Upgrade to Node 20 LTS
2. Update the installation guide to specify this LTS version of Node.js to be used
3. Update the installation or automated setup process to fail if the minimum LTS version isn't being used
   1. Create a Setup Script for the .env configuration file #1233
4. Test the application to make sure that it works with this LTS version
5. Our GitHub Actions need to be updated to specify this LTS version of Node.js to be used
6. Address all warnings and errors (especially those related to deprecation) to the best of your ability according to industry best practice
7. All existing tests must pass

Describe alternatives you've considered

• N/A

Approach to be followed (optional)

• See above

Additional context

• N/A

Potential internship candidates
Please read this if you are planning to apply for a Palisadoes Foundation internship PalisadoesFoundation/talawa#359

[Veer0x1]

would like to work on it

[Veer0x1]

@palisadoes @Cioppolo14 in push workflow somewhere npm is used and somewhere yarn is used. Is it intentional??

[Veer0x1]

And in push.yml file for node version we are using matrix strategy but it is not defined. So should change it to directly use the LTS version or create a matrix strategy??

[Veer0x1]

Why isn't issues getting closed, when PR get merged?

[palisadoes]

1. Don't remove yourself from assignment when the PR is completed and the issue isn't closed. It means we could assign the issue to someone else by accident
2. The automatic closing seems to only work on the default branch. We sometimes forget to close the issue

[Veer0x1]

Okay, I will take care of it from now onwards.