fix: depreacted request-promise module

[aryamohanan]

The request-promise module is now deprecated as it relies on the deprecated request package. Please refer to the following link for more information: request/request#3142

In light of this deprecation, we are discontinuing the use of the request-promise module and adopting the node-fetch module as an alternative. node-fetch is a lightweight and widely utilized package. It is important to note that Node.js has introduced a native fetch module starting from version 18. Consequently, once support for Node.js versions 14 and 16 is discontinued, we will seamlessly transition to utilizing the fetch module from node-fetch.

what's pending?

• Fix all unit test cases other than collector package
• Fix all unit test cases for collector package
• uninstall request-promise

Notable Changes

• request-promise response body is automatically parsed based on content type. With node-fetch, we need to manually parse the response according to the usage.

• request-promise automatically converts basic data types like objects and arrays to JSON-formatted strings by default, but node-fetch not.

• node-fetch does not automatically serialize the body in the same way as request-promise, so according to the response header content-type, manually converted to the desired response type.

• To address the certificate authorization issue with node-fetch, process.env.NODE_TLS_REJECT_UNAUTHORIZED was set to '0' in tests.

The changes are only in test files.

[kirrg001]

Great work!
As discussed, just moving the tls check to the mocharc 👍