[RORDEV-1488] ES startup settings related to loading ROR settings

[coutoPL]

🧐Enhancement (ES) ROR settings related JVM properties improvements

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Two new properties have been added to control retry behavior when loading ReadonlyREST settings from the index:

• com.readonlyrest.settings.loading.attempts.count (default 5) - specifies the number of retry attempts to load the in-index ReadonlyREST settings before falling back to the .readonlyrest file.
• com.readonlyrest.settings.loading.attempts.interval (default 5s) - defines the interval between retry attempts.

Summary by CodeRabbit

• New Features

  • Added configurable retry logic and fallback mechanisms for loading configuration, including new settings for delay, attempts count, and interval.
  • Improved error reporting for missing configuration indices.

• Improvements

  • Enhanced type safety and clarity for configuration loading parameters.
  • Refined configuration property names for better clarity and consistency.
  • More explicit and robust handling of configuration loading errors.
  • Updated JVM options to include default settings for loading delay, attempts count, and interval.

• Bug Fixes

  • Corrected error message mappings and improved error handling for non-existent indices.
  • Fixed method naming for reload interval configuration.

• Tests

  • Updated tests to reflect new configuration loading parameters and improved type safety.
  • Reduced redundant test calls and improved test setup for configuration loading scenarios.

• Chores

  • Updated plugin version to 1.65.0-pre4.