Fix FlatBuffers field names to use lowercase snake_case in lm_flatcfg.fbs

[shegazyy]

The FlatBuffers compiler warns when field names do not follow lowercase snake_case convention. Rename all non-conforming fields in lm_flatcfg.fbs (e.g. versionMajor -> version_major, startupConfig -> startup_config). Binary compatibility is preserved because field IDs (id:N) are unchanged.

Update configuration_manager.cpp to use the new generated accessor names, and update the expected JSON output fixtures in the config_mapping tests.

Closes #288

[github-actions]

License Check Results

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[License Check Output]
Extracting Bazel installation...
Starting local Bazel server (8.6.0) and connecting to it...
INFO: Invocation ID: 76215c44-69c0-4925-8454-0bf52fb12e43
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Analyzing: target //:license-check (167 packages loaded, 10159 targets configured)

Analyzing: target //:license-check (168 packages loaded, 10283 targets configured)

INFO: Analyzed target //:license-check (169 packages loaded, 10409 targets configured).
[12 / 16] JavaToolchainCompileClasses external/rules_java+/toolchains/platformclasspath_classes; 0s disk-cache, processwrapper-sandbox ... (2 actions running)
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INFO: Found 1 target...
Target //:license.check.license_check up-to-date:
  bazel-bin/license.check.license_check
  bazel-bin/license.check.license_check.jar
INFO: Elapsed time: 24.530s, Critical Path: 2.62s
INFO: 16 processes: 12 internal, 3 processwrapper-sandbox, 1 worker.
INFO: Build completed successfully, 16 total actions
INFO: Running command line: bazel-bin/license.check.license_check ./formatted.txt <args omitted>
usage: org.eclipse.dash.licenses.cli.Main [-batch <int>] [-cd <url>]
       [-confidence <int>] [-ef <url>] [-excludeSources <sources>] [-help] [-lic
       <url>] [-project <shortname>] [-repo <url>] [-review] [-summary <file>]
       [-timeout <seconds>] [-token <token>]

[github-actions]

The created documentation from the pull request is available at: docu-html

[shegazyy]

Hey @NEOatNHNG 🙏 ready for review whenever you have a moment!

[NicolasFussberger]

Hi @shegazyy, thanks for your contribution!
Could you shortly update your branch to the latest main.

[shegazyy]

@NicolasFussberger branch is updated with the latest main

[NicolasFussberger]

@shegazyy would you like to do the same fix also for score/launch_manager/src/daemon/src/alive_monitor/config/hm_flatcfg.fbs and score/launch_manager/src/daemon/src/alive_monitor/config/hmcore_flatcfg.fbs ?
Same warnings are coming from these flatbuffer schemas as well.