feat: allow saving version 0 (backport #1002)

[mergify]

This patch makes SetInitialVersion(0) calls valid, which previously would error during SaveVersion. This is particularly useful from server/v2 which processes and saves a Genesis block at version initialHeight - 1, which is 0 in the default case.

Unrelated to above is some clean up; legacydump is a compiled binary file and shouldn't be committed. An amd64 binary is presently in master, which doesn't run on e.g. arm64. Instead of this, removed the binary and updated the Makefile and Github action to build where required (by tests).

Summary by CodeRabbit

Summary by CodeRabbit

• New Features

  • Enhanced version management capabilities in the MutableTree structure.
  • Improved error handling and validation in the nodeDB structure.
  • Added tracking for initial version status in the Options configuration.
  • New test cases added for comprehensive coverage of MutableTree functionality.
  • Introduced a build step for the legacydump binary in the CI process.

• Bug Fixes

  • Adjusted return value in version retrieval to better indicate absence of versions.

• Documentation

  • Updated method signatures to reflect changes in version handling and error management.
  • Revised documentation to clarify updates in the DeleteVersionsFrom method.
  • Added entries to .gitignore to exclude unnecessary files and directories.

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This is an automatic backport of pull request #1002 done by [Mergify](https://mergify.com).

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