Ledger cleanup service's configuration needs to be tied to something

[sagar-solana]

Problem

#7515 introduced a fixed number of slots that ledger cleanup service will keep around in the ledger (MAX_LEDGER_SLOTS).

This number isn't tied to slot time or snapshot interval and it might need to.
For example:

• If the snapshot interval is longer than the MAX_LEDGER_SLOTS then we cannot guarantee being able to restart
• If the slot time or epoch length is reduced, the number of slots we need to keep around might increase

Proposed Solution

If possible, justify the chosen value of MAX_LEDGER_SLOTS using a combination of snapshot_interval (cap or fix snapshot interval?) and Slot time.

Tag: @pgarg66

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