Force file paths computed during Baremetal deploy to always have forward slashes

[cannikin]

I ended up not adding the --windows flag for now because there are paths computed in several different places and I couldn't find an elegant way to give all of the surrounding functions access to the result of the flag. Let's go with this for now and if we get complaints about not being able to deploy to Windows then we can revisit.

Closes #6124

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[cannikin]

Turns out that slash package is ESM and it makes everything blow up. Just wrote a simple replace() instead.

[russell-davis]

I'm planning on testing this out tonight! Thanks so much for getting a PR together so fast!!

[pantheredeye]

Bookmarking this here for your reference... I found this platform check: const join = process.platform === 'win32' ? path.win32.join : path.posix.join

That could be shortened to const join = path.posix.join to force forward slashes.

The code below that could be:

export const execaOptions = {
  cwd: join(getPaths().base),
  stdio: 'inherit',
  shell: true,
  cleanup: true,
}
...

await sshExec(ssh, deployPath, 'cp', [
         join('web', 'dist', '200.html'),
         join('web', 'dist', '200.html.orig'),
       ])

... etc.

[cannikin]

Great catch @pantheredeye , updated!