feat: unlock pending btc proposals when doing retry

[mpetrun5]

Store btc proposals as executed if transaction sent.
Unlock proposals when doing retry to release pending transactions.
Retry can be only called by admin and should only be done when sure that the process that failed
has finished.

Retry mechanism will be soon be revisited and implemented so it is called from a single chain and per depositNonce to make it more granular and flexible.

Description

Related Issue Or Context

Closes: https://www.notion.so/veridise/Unexecuted-proposals-may-be-lost-ddbd27a7e7a34bbd881469e1532d82d5

How Has This Been Tested? Testing details.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation

Checklist:

• I have commented my code, particularly in hard-to-understand areas.
• I have ensured that all acceptance criteria (or expected behavior) from issue are met
• I have updated the documentation locally and in docs.
• I have added tests to cover my changes.
• I have ensured that all the checks are passing and green, I've signed the CLA bot

[github-actions]

Go Test coverage is 67.2 %\ ✨ ✨ ✨

[github-actions]

Go Test coverage is 66.7 %\ ✨ ✨ ✨