Add changelog fragments

Author: dnadales

ouroboros-consensus-cardano/changelog.d/20240927_125151_damian.nadales_1260_remove_cdbFutureBlocks.md

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+
+### Breaking
+
+- Remove `CheckInFuture m blk` from `openChainDB`.
+
+### Non-Breaking
+
+- Remove references to `Ouroboros.Consensus.Fragment.InFuture`.
+- Adapt the code to account for the removed `cdbFutureBlocks` and related fields.

ouroboros-consensus-diffusion/changelog.d/20240927_131047_damian.nadales_1260_remove_cdbFutureBlocks.md

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+### Breaking
+
+- Remove `CheckInFuture m blk` argument from `openChainDB`.
+
+### Patch
+
+- Remove references to `Ouroboros.Consensus.Fragment.InFuture`.

ouroboros-consensus/changelog.d/20240927_125606_damian.nadales_1260_remove_cdbFutureBlocks.md

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+### Breaking
+
+- Remove `cdbFutureBlocks` from `ChainDbEnv`.
+- Remove `BlockInTheFuture`, `ChainSelectionForFutureBlock`, `CandidateContainsFutureBlocks`, and `CandidateContainsFutureBlocksExceedingClockSkew` from `TraceAddBlockEvent`.
+- Remove `cdbCheckInFuture` from `CBD`.
+- Remove `cdbsCheckInFuture` from `ChainDbSpecificArgs`.
+- Remove `CheckInFuture m blk` argument from `completeChainDbArgs`.
+- Remove `CheckInFuture m blk` argument from `initialChainSelection`.
+- Remove `cdbsCheckInFuture` from `ChainDbSpecificArgs`.
+- Delete module `Ouroboros.Consensus.Fragment.InFuture`. `ClockSkew` functions live now in `Ouroboros.Consensus.MiniProtocol.ChainSync.Client.InFutureCheck`.