fix: pluralise time units in created time output

[adityashekhawat1999]

solves #709
Overview
This PR improves the UX of by fixing the pluralisation of time units in the Created Time output (for example, displaying “2 hours ago” instead of “2 hour ago”).

Changes
Before:

After:

• Updated time formatting logic to correctly pluralise time units (minute, hour, day) based on their values.
• Verified the behaviour by building and running the Harbor CLI locally and checking the updated output.

Note
This is a small UX improvement so i addressed it directly in a PR rather than opening a separate issue first.

[qcserestipy]

Thanks for the contribution! However, our project policy requires that every PR is linked to a pre-existing, approved issue. Could you please open an issue describing the pluralisation bug first and reference it in this PR? Without a linked issue, we'll need to close this PR. Thanks for understanding!

[adityashekhawat1999]

Thanks for the contribution! However, our project policy requires that every PR is linked to a pre-existing, approved issue. Could you please open an issue describing the pluralisation bug first and reference it in this PR? Without a linked issue, we'll need to close this PR. Thanks for understanding!

Thanks i have opened the issue