added delete option for logged hours in "Requested" section

[spicy-pies]

• Added the deleteRequestedLog function in mentee.js
• The route is: DELETE /mentee/delete-requested-log
• It accepts { logId }
• Check if zid exists
• If does, then we check if the logs of that mentee is in "pending" state, and hence the respective logs are deleted from the hours table.
• Handled fail cases

[railway-app]

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[linear]

WIT-251 Add delete option for logged hours in "Requested" section