Upgrade OCamlformat to 0.29

[cknitt]

Summary

• upgrade OCamlformat from 0.27 to 0.29
• apply the resulting mechanical reformat separately from the OCaml 5.5 compiler changes

OCamlformat 0.27 requires OCaml <5.4, so this prepares the development toolchain for the following OCaml 5.5 upgrade while keeping its formatting churn isolated.

This is the third PR in the "Flow Forward" series. It is stacked on the Flow parser 0.320.0 upgrade, and the OCaml 5.5 upgrade follows on top.

Related to #8567.

[codecov]

Codecov Report

❌ Patch coverage is 79.67574% with 351 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.92%. Comparing base (9fd2d39) to head (8acea61).

Files with missing lines	Patch %	Lines
analysis/reanalyze/src/dead_common.ml	62.74%	38 Missing ⚠️
tools/src/tools.ml	75.00%	24 Missing ⚠️
analysis/src/completion_back_end.ml	88.17%	22 Missing ⚠️
analysis/src/find_files.ml	70.00%	21 Missing ⚠️
analysis/src/cmt_viewer.ml	0.00%	20 Missing ⚠️
analysis/src/dump_ast.ml	8.33%	11 Missing ⚠️
analysis/src/process_cmt.ml	62.06%	11 Missing ⚠️
analysis/src/process_extra.ml	76.08%	11 Missing ⚠️
compiler/gentype/translate_core_type.ml	45.00%	11 Missing ⚠️
tools/src/migrate.ml	75.00%	10 Missing ⚠️
... and 64 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8591      +/-   ##
==========================================
- Coverage   75.92%   75.92%   -0.01%     
==========================================
  Files         475      475              
  Lines       63033    63015      -18     
==========================================
- Hits        47859    47842      -17     
+ Misses      15174    15173       -1     

Files with missing lines	Coverage Δ
analysis/reanalyze/src/dce_file_processing.ml	95.00% <100.00%> (ø)
analysis/reanalyze/src/dead_optional_args.ml	92.00% <100.00%> (ø)
analysis/reanalyze/src/declarations.ml	85.71% <100.00%> (-0.96%)	⬇️
analysis/reanalyze/src/exn_lib.ml	100.00% <100.00%> (ø)
analysis/reanalyze/src/file_annotations.ml	68.42% <100.00%> (-1.58%)	⬇️
analysis/reanalyze/src/log_.ml	67.22% <100.00%> (ø)
analysis/reanalyze/src/side_effects.ml	77.19% <100.00%> (ø)
analysis/src/cmt.ml	88.23% <100.00%> (ø)
analysis/src/codemod.ml	68.96% <100.00%> (ø)
analysis/src/completion_expressions.ml	79.84% <100.00%> (ø)
... and 105 more

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commit: 8acea61

[github-actions]

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