Synchronization with `main` backlog

[ppkarwasz]

This meta-issue lists the PRs or modifications that didn't make it to main yet. Feel free to modify it after each merged PR that you don't have time or can not port immediately:

• Revamp the Extending, Plugins, Architecture, and Programmatic configuration pages #2716
• Implement MessageFactory-namespaced logger registry (blocked by 2.24.1 release) #2962
• Add GraalVM reachability metadata to main #3055
• Migrate log4j-jakarta-smtp to JUnit 5 #3052
• Create DefaultLayout independent of PatternLayout #3118
• Improve validation for StringMatchFilter for null/empty text #3153 #3158
• Remove outdated @BaselineIgnore annotations #3133
• Document API compatibility checks #3175 (not needed before first 3.0.0 release)
• Reopen log file when rollover is unsuccessful #3226
• Fix(#2769): Modify the annotation processor in 2.x to give a warning if a plugin builder attribute does not have a public setter. #3195
• Use garbage-free formatter for s and S patterns #3338
• Add requiresLocation function for FailoverAppender #3257 #3259
• Add requiresLocation function for AsyncAppender (#3257) #3260
• Fix(#3239) NPE, for RegexFilter creator. #3265
• Feat(SystemClock): Added PreciseClock implementation to the system clock class, for the benefit of Java 8 users. #3217 (documentation part)
• Fix(Documentation): Fixed ConfigurationStrSubstitutor dccumenation. #3381
• Minimize lock usage in InternalLoggerRegistry #3418
• Improve configuration error handling of HttpAppender #3438
• Fix formatting of s pattern #3469
• Add collectionName and databaseName attributes to MongoDbProvider #3467

Backport PRs:

• [main] Correct example property syntax for PatternMatch under ScriptP… #3583
• [main] Create DefaultLayout independent of PatternLayout #3584
• Adjust GcpLayout JSON to latest format #3586