ledger-tool: Use OutputFormat printer in program subcommand

[CriesofCarrots]

Problem

The solana-ledger-tool program subcommand uses solana_cli_output::OutputFormat, but uses its own custom printer for no reason.

Summary of Changes

Use OutputFormat::formatted_string() to make usage more consistent
No functional changes, except that the order of fields for OutputFormat::JsonCompact changes slightly, due to using serde_json::to_value(item).unwrap().to_string() under the hood (instead of serde_json::to_string(&output).unwrap()). We don't guarantee the order of json fields, so this change should be non-breaking.

[steviez]

LGTM! FYI @dmakarov - I doubt we have anything automated that is consuming this json downstream, but figured I'd mention it anyways. And even if something is consuming it, it should be parsing the whole json object and querying based on fields, so this change shouldn't matter anyways

[codecov]

Codecov Report

Merging #34475 (9b065d1) into master (aaccbdd) will increase coverage by 0.0%.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #34475   +/-   ##
=======================================
  Coverage    81.8%    81.8%           
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  Files         819      819           
  Lines      220894   220894           
=======================================
+ Hits       180753   180834   +81     
+ Misses      40141    40060   -81