[BUG]: cannot resume sessions if background script becomes inactive

[sidvishnoi]

Steps to reproduce

1. Go to monetized website.
2. Let some monetization happen.
3. Go idle (switch browser to new empty tab or switch apps) for +30s
4. Come back to monetized website later.

Expected result

Monetization should resume.

Actual result

Monetization doesn't resume, the popup says "this site is not monetized".
What happened is, as background service worker got killed, we lost this.sessions, but content script still has the details.

Screenshots or videos

No response

Additional context

Should call startPaymentSession when resuming and we've no sessions (but payload contains the session details).

Operating system

Linux

Operating system version

No response

Browsers

Chrome

Browser version

No response

Extension version

main branch as of today

[sidvishnoi]

Closing in favor of #416