Fail to run db migrate-dev on Windows

[nodtem66]

This is an issue for the PR #3020

Describe the bug

Wasp generator produces invalid Windows path for MyApp/.wasp/out/sdk/dev/index.ts (16,50)

To Reproduce
Steps to reproduce the behavior:

• Clone commit 04193ae
• Merge Fix Windows EOF for waspc-test and waspls-test #3027 for fixing waspc-test and waspcls-test (optional)
• Merge Fix #48: Missing npm on native Windows #3020 for fixing npm on Windows shell
• Create new project

cabal run wasp-cli -- new MyApp

• Run db migrate-dev

cabal run wasp-cli -- db migrate-dev

• The console will show this error:

? --- Setting up database... -----------------------------------------------------
[   Db  !] Error: P1003
[   Db  !]
[   Db  !] Database `dev.db` does not exist at `D:\src\github\wasp\waspc\examples\MyApp\.wasp\out\db\./dev.db`.
[   Db  !]
[   Db   ] Environment variables loaded from .env
[   Db   ] Prisma schema loaded from ..\db\schema.prisma
[   Db   ]
[   Db   ] ? Generated Prisma Client (v5.19.1) to .\..\..\..\node_modules\@prisma\client in 142ms
[   Db   ]
? --- Database successfully set up. ----------------------------------------------
? --- Building SDK... ------------------------------------------------------------

[  Wasp  ] dev/index.ts(16,50): error TS1002: Unterminated string literal.
? --- [Error] Your wasp project failed to compile: -------------------------------
- SDK build failed with exit code: 2
? --- [Error] Compilation of wasp project failed: --------------------------------
1 errors found

This is the content of dev/index.ts(16,50)

export function resolveProjectPath(path: string): string {
const waspProjectDirFromWebAppDir = '..\..\..\'
return joinPaths(waspProjectDirFromWebAppDir, path)
}

Environment:

• OS: Windows 11 (Build 10.0.26100)
• Cabal 3.12.1.0
• Stack 3.3.1
• HLS 2.10.0.0
• GHC 8.10.7 (base-4.14.3.0)

PS. I'm working on this issue.