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Merge bitcoindevkit/bdk#1601: fix(core): calling `CheckPoint::insert` with existing block must succeed

<a class=hub.com/bitcoindevkit/bdk/commit/<a class="double-link" href="https://git"><a class=hub.com/bitcoindevkit/bdk/commit/3ae9ecba8c893750fa2ed5dfdbb1f4ee84a0b228">3ae9ecba8<a href="https://github.com/bitcoindevkit/bdk/commit/6d610bf495311af3454a56cbbf38edde3fcee037"> test: fix off-by-one in `checkpoint_insert_existing` (valued mammal)
<a class="double-link" href="https://github.com/bitcoindevkit/bdk/commit/e6aeaea0c69472e4c2dcf0f5e2f632f43733529d">e6aeaea0c</a><a href="https://github.com/bitcoindevkit/bdk/commit/6d610bf495311af3454a56cbbf38edde3fcee037"> doc(core): document panic for `CheckPoint::insert` (valued mammal)
</a><a class="double-link" href="https://github.com/bitcoindevkit/bdk/commit/2970b83f30ca7071f0502de395327eb3671a512b">2970b83f3</a> fix(core): calling `CheckPoint::insert` with existing block must succeed (志宇)

Pull request description:

  ### Description

  Previously, we were panicking when the caller tried to insert a block at height 0. However, this should succeed if the block hash does not change.

  ### Notes to the reviewers

  For context:

  * https://github.com/lightningdevkit/ldk-node/pull/358
  * https://discord.com/channels/753336465005608961/978744259693916230/1283050849429356629

  ### Changelog notice

  * Fix `CheckPoint::insert` to not panic when inserting existing genesis block (same block height and hash).

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

  #### Bugfixes:

  ~~* [ ] This pull request breaks the existing API~~
  * [x] I've added tests to reproduce the issue which are now passing

ACKs for top commit:
  ValuedMammal:
    Self ACK 3ae9ecba8c893750fa2ed5dfdbb1f4ee84a0b228
  notmandatory:
    ACK 3ae9ecba8c893750fa2ed5dfdbb1f4ee84a0b228

Tree-SHA512: 638d8aacab3f9364045a77909d31a0b0e55

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