[Backport 1.28.x] Make seeder thread pool sizes configurable (fixes #1429)#1542
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…v vars Allow GWC_SEEDER_CORE_POOL_SIZE and GWC_SEEDER_MAX_POOL_SIZE to be specified as Java system properties or OS environment variables, with system properties taking precedence. Falls back to the Spring XML constructor arguments (16/32) when not set or invalid. Invalid values (non-numeric, zero, negative) are logged as warnings and the defaults are used. If corePoolSize exceeds maxPoolSize after resolution, maxPoolSize is automatically adjusted upward to match. Includes unit tests and documentation updates. Closes #1429
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Address review feedback from pmauduit: - Replace SpEL constructor-arg expressions with bean ref injection (consistent with all other beans in geowebcache-core-context.xml) - Use StringUtils.hasText(), fix test copyright, rename test method - Add tests for ServerConfiguration constructor and env var precedence
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Backport #1535
Authored by: @petersmythe