fix: handle write_file toolset issue (#4174)

[pragneshbagary]

This PR fixes 4174,

Issue:
write_file doesn't create parent directories automatically

f, err := ts.sftp.Create(guestPath) if err != nil { return nil, nil, err }

The sftp.Create() function tries to create a file, but it doesn't create parent directories.So when written to files with no parent dierectories, sftp.Create() fails with "file does not exist".

Fix:
Ensure the parent directory exists before creating the file.
dir := filepath.Dir(guestPath) err = ts.sftp.MkdirAll(dir) if err != nil { return nil, nil, err }

filepath.Dir(guestPath) extracts the parent directory from the full path
ts.sftp.MkdirAll(dir) creates all parent directories

[AkihiroSuda]

The test has to be updated too

lima/hack/bats/tests/mcp.bats

Lines 255 to 256 in e21b634

	@test 'write_file creates the directory if it does not yet exist' {
	skip "see https://github.com/lima-vm/lima/issues/4174"

[AkihiroSuda]

Also please squash the commits