fix(script): Insomnia.global.set is not updating environment when only global base environment is activated[INS-5795]

[cwangsmv]

Highlights: Fix the issue that Insomnia.global.set is not updating environment when global base environment is activated. Modify Insomnia script to make globals and baseGlobals point to the same environment object when global base environment is activated.

Closes https://github.com/Kong/insomnia/issues/8789