Fix compilation errors in blockchain.cpp related to serialization, UTXO dumping, and path conversion #31735

1. 
   krishpranav commented at 2:06 pm on January 25, 2025: none

   issue: #31373

   updated path conversion logic to handle std::string to fs::path, and addressing undeclared identifiers such as DumpUTXOSet.

2. rpc: blockchain[dumptxoutset] b12390da2d
3. test: functional[rpc_dumptxoutset_pipe] 91dbe67297
4. 
   DrahtBot commented at 2:06 pm on January 25, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/31735.

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   Concept NACK	l0rinc, i-am-yuvi

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5. DrahtBot added the label CI failed on Jan 25, 2025
6. 
   DrahtBot commented at 2:10 pm on January 25, 2025: contributor

   🚧 At least one of the CI tasks failed. Debug: https://github.com/bitcoin/bitcoin/runs/36165560973

   Try to run the tests locally, according to the documentation. However, a CI failure may still happen due to a number of reasons, for example:

   • Possibly due to a silent merge conflict (the changes in this pull request being incompatible with the current code in the target branch). If so, make sure to rebase on the latest commit of the target branch.

   • A sanitizer issue, which can only be found by compiling with the sanitizer and running the affected test.

   • An intermittent issue.

   Leave a comment here, if you need help tracking down a confusing failure.

7. 
   l0rinc commented at 2:47 pm on January 25, 2025: contributor

   NACK
8. 
   i-am-yuvi commented at 1:47 pm on January 27, 2025: contributor

   NACK
9. 
   fanquake commented at 1:52 pm on January 27, 2025: member

   See #31560.
10. fanquake closed this on Jan 27, 2025

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Contributors
krishpranav DrahtBot l0rinc i-am-yuvi fanquake

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