low balance refresh

[pjain1]

This is required for showing banners on page on different credit thresholds. Can use credit_allocation and approx_low_credits_balance from the on credit trial billing issue metadata to figure out the percent left and show appropriate message, note that approx_low_credits_balance gets updated only after low_credit flag is set i.e. when we receive credit dropped alert from Orb and then its updated every hour, this is just an optimization to prevent checking the credit balance when we know the balance is above Orb alert treshold.

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!