feat: allow translation of more postman scripts

[lanthoor]

Description

1. This PR allows translation of additional Postman specific scripts.
   • pm.response.json() → res.getBody()
   • pm.environment.has("xyz") → bru.getEnvVar("xyz") !== undefined && bru.getEnvVar("xyz") !== null
   • pm.expect( ... ) → expect( ... )
2. Tests to cover the above scenarios
3. Fix an incorrect regex in the translation script
   • 'pm.response.to.have\\.status\\(' → 'pm\\.response\\.to\\.have\\.status\\('

Fixes #1973

Contribution Checklist:

• The pull request only addresses one issue or adds one feature.
• The pull request does not introduce any breaking changes
• I have added screenshots or gifs to help explain the change if applicable.
• I have read the contribution guidelines.
• Create an issue and link to the pull request.

Note: Keeping the PR small and focused helps make it easier to review and merge. If you have multiple changes you want to make, please consider submitting them as separate pull requests.

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[lanthoor]

Had to close #1972 because I messed up the branch. Can we get this through please? @helloanoop @sanjai0py

[BBE-91]

Great, will be very helpfull for importing collection.
So now #1909 can be closed as well ? @helloanoop