Only prune finalized randomness entries

[GabrielMartinezRodriguez]

Linked Issues

• closes https://linear.app/happychain/issue/HAPPY-258/purge-only-finalized-randomnness

Description

Added a new constant FINALIZED_STATUSES to track completed randomness states and modified the pruning logic to only remove entries that have reached a final status. This prevents premature deletion of active randomness entries.

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Checklist

Basics

• B1. I have applied the proper label & proper branch name (e.g. norswap/build-system-caching).
• B2. This PR is not so big that it should be split & addresses only one concern.
• B3. The PR targets the lowest branch it can (ideally master).

Correctness

• C1. Builds and passes tests.

• C2. The code is properly parameterized & compatible with different environments (e.g. local,
  testnet, mainnet, standalone wallet, ...).

• C3. I have manually tested my changes & connected features.

• C4. I have performed a thorough self-review of my code after submitting the PR,
  and have updated the code & comments accordingly.

Architecture & Documentation

• D1. I made it easy to reason locally about the code, by (1) using proper abstraction boundaries,
  (2) commenting these boundaries correctly, (3) adding inline comments for context when needed.
• D2. All public-facing APIs & meaningful (non-local) internal APIs are properly documented in code
  comments.
• D3. If appropriate, the general architecture of the code is documented in a code comment or
  in a Markdown document.

[GabrielMartinezRodriguez]

• Deploy randomness service #416 : 2 dependent PRs (#434 , #441 )
• Add config contract #404
• Randomness service: Improve performance and reliability #372
• Add transaction submission failure hook and error handling #366
• Increase default RPC timeout to 2000ms #365
• Add configurable HTTP polling interval for block monitoring #362
• Force initialization before using the TXM #361
• Script to monitor randomness service #325
• Script to easily launch the randomness service locally #324
• Submit drand numbers #318
• Random oracle contracts #307
• Only prune finalized randomness entries #305 👈 (View in Graphite)
• Add NewBlock hook #304
• Refactors the randomness service to be able to process pending commitments  #303
• Add SQLite persistence to randomness service #300
• Txm no longer receives Viem objects #298 : 1 other dependent PR (#299 )
• Add flush mechanism #289 : 1 other dependent PR (#297 )
• Allow run multiple txm simultaneously within the same service #285
• Added docs for txm #272
• Mutex in tx monitor #264
• Purge transactions #232
• Txm hooks #229
• Use kysely instead of mikro-orm #250
• master

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[linear]

HAPPY-258 Purge only finalized randomnness

[not-reed]

mentioned in the other PR also, but do you want to prune this.map here as well?