refactor: Return a Valid from merge_right

[tusharmath]

Currently merge_right can never fail, we need to fix that by returning a Valid

Technical Requirements

• Change the type signature of merge_right to return a Valid<Self, String>

[tusharmath]

/bounty $50

[algora-pbc]

💎 $50 bounty • Tailcall Inc.

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Attempt	Started (GMT+0)	Solution
🔴 @asr2003	Sep 15, 2024, 7:33:48 PM	WIP

[asr2003]

/attempt #2815

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[algora-pbc]

@asr2003: Reminder that in 1 days the bounty will become up for grabs, so please submit a pull request before then 🙏

[algora-pbc]

The bounty is up for grabs! Everyone is welcome to /attempt #2815 🙌

[meskill]

MergeRight should stay as is while for other way of merging new specific traits were added