feat: wire episode availability to Sonarr scanner

[0xSysR3ll]

Description

Part 2 of #1671 to make the review easier.
Implemented episode availability Sonarr's scanner.

Note

Can't make this a proper stack since #1671 was opened against my fork.

How Has This Been Tested?

Same tests as part 1.

Screenshots / Logs (if applicable)

Checklist:

• I have read and followed the contribution guidelines.
• Disclosed any use of AI (see our policy)
• I have updated the documentation accordingly.
• All new and existing tests passed.
• Successful build pnpm build
• Translation keys pnpm i18n:extract
• Database migration (if required)

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[fallenbagel]

Is the media server scanner gonna be stacked on this PR?

[0xSysR3ll]

Is the media server scanner gonna be stacked on this PR?

It's supposed to but I guess I missed a step somewhere.