Ensure non Scala version specific specs being executed for Scala 3 as well

[987Nabil]

A lot of specs are in the scala-2 source folders. For example the JsonCodecSpec.
This prevents them from being executed on for Scala 3.
After taking a short look, it seems this will take some time to migrate, since the tests depend on some generators with complex types. These types are evaluated more strict or just different by the Scala 3 compiler and need to be adjusted to make it work across Scala 2 and 3.

@jdegoes I think this might be also a reason why we had some bugs reports, where zio-schema was acting different for Scala 3.

[jdegoes]

/bounty $750

[algora-pbc]

💎 $750 bounty • ZIO

Steps to solve:

1. Start working: Comment /attempt #709 with your implementation plan
2. Submit work: Create a pull request including /claim #709 in the PR body to claim the bounty
3. Receive payment: 100% of the bounty is received 2-5 days post-reward. Make sure you are eligible for payouts

Thank you for contributing to zio/zio-schema!

Add a bounty • Share on socials

Attempt	Started (GMT+0)	Solution
🟢 @987Nabil	Aug 2, 2024, 2:51:43 PM	#721

[987Nabil]

/attempt #709

Algora profile	Completed bounties	Tech	Active attempts	Options
@987Nabil	61 ZIO bounties + 1 bounty from 1 project	Scala	﹟1522, ﹟2960	Cancel attempt

[algora-pbc]

💡 @987Nabil submitted a pull request that claims the bounty. You can visit your bounty board to reward.

[algora-pbc]

🎉🎈 @987Nabil has been awarded $750! 🎈🎊

• Share on socials
• Give feedback