make build scripts cross platform

[davidda]

Describe the bug

Some of the PrimeNG git repo's (p)npm scripts cannot be executed on Windows due to the way environment variables are used in the scripts.

The solution is to use the "cross-env" tool where required. Tested under Ubuntu and Windows.

Pull Request Link

#17497

Reason for not contributing a PR

• Lack of time
• Unsure how to implement the fix/feature
• Difficulty understanding the codebase
• Other

Other Reason

No response

Reproducer

https://stackblitz.com/github/primefaces/primeng-issue-template

Environment

Angular version

19

PrimeNG version

v19

Node version

No response

Browser(s)

No response

Steps to reproduce the behavior

build primeng on windows -> fail

Expected behavior

it builds

[mertsincan]

Fixed in #17497