[automatic failover] Replace EchoStrategy with PingStrategy

[atakavci]

The default strategy, EchoStrategy is replaced with PingStrategy and dropped.

[Copilot]

Pull Request Overview

This PR replaces the default health check strategy EchoStrategy with PingStrategy across the entire codebase, updating both implementation and documentation to reflect this change.

Key changes:

• Replace EchoStrategy class with PingStrategy class that uses Redis PING command instead of ECHO
• Update all test files to use the new strategy name and expected behavior
• Update documentation to reflect the new default strategy

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/main/java/redis/clients/jedis/mcf/PingStrategy.java	Renamed class from EchoStrategy to PingStrategy and changed health check from ECHO to PING command
src/main/java/redis/clients/jedis/MultiDbConfig.java	Updated imports, documentation, and default strategy references to use PingStrategy
src/test/java/redis/clients/jedis/mcf/PingStrategyIntegrationTest.java	Renamed test class and updated all test methods to use PingStrategy
src/test/java/redis/clients/jedis/mcf/HealthCheckTest.java	Updated test methods and comments to reference PingStrategy instead of EchoStrategy
src/test/java/redis/clients/jedis/mcf/HealthCheckIntegrationTest.java	Updated test implementation to use PING command and expect PONG response
src/test/java/redis/clients/jedis/mcf/MultiDbConnectionProviderInitializationTest.java	Updated test to use PingStrategy.DEFAULT
src/test/java/redis/clients/jedis/mcf/DefaultValuesTest.java	Updated test assertions and comments to reference PingStrategy
docs/failover.md	Updated documentation to describe PingStrategy as the default instead of EchoStrategy
.github/wordlist.txt	Removed EchoStrategy and added PingStrategy to the wordlist

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