SK-2049: Fix Error Message for Collect Elements When Label Is Not Provided

[saileshwar-skyflow]

Problem Statement

• When a label is not provided for Collect Elements, the expected error message should be “Invalid value.” But, the message was incorrect for PIN, Date elements, and Input fields.

Outcome

• Updated the error handling to return the correct “Invalid value” message when the label is missing.
• Ensured consistent behavior across PIN, Date elements, and Input fields.

[github-actions]

✅ Gitleaks Findings: No secrets detected. Safe to proceed!

[github-actions]

Semgrep findings: No issues found, Good to merge.