fix: better Json parsing errors

[koivunej]

Before any json parsing from the http api only returned errors were per field errors. Now they are done using serde_path_to_error, which at least helped greatly with the disk_usage_eviction_run used for testing. I don't think this can conflict with anything added in #5310.

[github-actions]

2184 tests run: 2098 passed, 0 failed, 86 skipped (full report)

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Flaky tests (3)

Postgres 16

• test_crafted_wal_end[last_wal_record_crossing_segment]: release
• test_pitr_gc: debug

Postgres 15

• test_statvfs_pressure_usage: debug

Code coverage (full report)

• functions: 55.2% (9457 of 17136 functions)
• lines: 82.3% (54654 of 66416 lines)

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_{The comment gets automatically updated with the latest test results
5cb72df at 2023-12-14T00:14:21.838Z :recycle:}

[problame]

Nice, didn't know this crate existed.

Didn't vet it as part of this review, though.

[koivunej]

Nice, didn't know this crate existed.

Didn't vet it as part of this review, though.

It is not a new dependency for us since some earlier PR.