Rename openReplWindow to openWindow

[sergeichestakov]

Why

Follow on to this PR: https://github.com/replit/repl-it-web/pull/34872, this commit renames openReplWindow to openWindow

See discussion there but same rational:

"Repl window" doesn't really make sense anymore now that we no longer have a splash screen window or otherwise have any other distinction between windows.

Fixes WS-762

What changed

Rename openReplWindow to openWindow external API and event. Note that this is a breaking change but we can make web resilient to it to prevent disruptions to experience.

Test plan

• Static checks/CI passes
• Should see this API stop working temporarily (until the relevant web PR is deployed)

[linear[bot]]

WS-762 Rename openReplWindow to openWindow in the native app

[sergeichestakov]

this should be merged and released after this commit has been deployed: https://github.com/replit/repl-it-web/pull/35074