Fix missing error handling in file:copy for non-existent destination directory

[DharshiBalasubramaniyam]

Purpose

Fixes ballerina-platform/ballerina-library#5738

Examples

With the implementation of this PR, the code below returns FileNotFoundError if the directory foo does not exist.

import ballerina/file;
import ballerina/io;

public function main() returns error? {
    string sourcePath = "insert.sql";
    string destPath = "foo/insert.sql";
    file:Error? copy = file:copy(sourcePath, destPath);
    if copy is file:Error {
        io:println(copy.message());
    }
}

Output for the above code:

The target directory does not exist: insert.sql -> foo/insert.sql"

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility

[CLAassistant]

All committers have signed the CLA.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.64%. Comparing base (682cc08) to head (58d34be).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #576      +/-   ##
============================================
+ Coverage     82.20%   82.64%   +0.43%     
  Complexity       91       91              
============================================
  Files            18       18              
  Lines           770      772       +2     
  Branches        164      164              
============================================
+ Hits            633      638       +5     
+ Misses          118      115       -3     
  Partials         19       19              

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[daneshk]

@niveathika can you check.

[DharshiBalasubramaniyam]

Hi @niveathika, please check this when you are available and inform me of any required changes.

Thanks

[niveathika]

LGTM