Update Airdrop Vesting Schedule to 6-Month Cliff with 1-Month Linear Vesting

[obchain]

This PR modifies the vesting schedule for airdrop vests by updating the vesting period from a 6-month cliff and 3-month linear vesting to a 6-month cliff with a 1-month linear vesting. The script iterates through all existing vest IDs, checks for eligible airdrop vests, and updates them accordingly. Key updates include:

• Adjusted LINEAR_DURATION to 1 month (86400 * 31 seconds).
• Script filters for vests in the airdrop category (category 3) with a cliff duration greater than 90 days, as these are eligible for updating.
• Calls updateCliffDuration on the eligible vest IDs to apply the new cliff and linear duration parameters.