Fix replaceParam when the replaced string contains a replacement marker

[shichaoyuan]

• The issue of the current replacement algorithm repeatedly replacing strings containing {} has been fixed.
• Unnecessary regular expression replacements have been replaced with simple string replacements.

For replaceParam("from {} to {}", "a={}", "b={}"), the correct output should be from a={} to b={}, not from a=b={} to {}.

Closes apache/skywalking#13591

[Copilot]

Pull request overview

This PR fixes a bug in the AbstractLogger.replaceParam method where replacement strings containing the {} marker would be incorrectly processed, causing repeated replacements. The fix replaces the regex-based approach with a more efficient StringBuilder-based implementation that correctly handles replacement strings containing {} by tracking the position after each replacement.

• Replaces regex-based string replacement with StringBuilder for efficiency and correctness
• Adds comprehensive test coverage for both normal cases and the specific bug scenario
• Updates CHANGES.md to document the fix

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/logging/core/AbstractLogger.java	Refactored replaceParam method to use StringBuilder instead of regex, fixing the double-replacement bug and improving performance
apm-sniffer/apm-agent-core/src/test/java/org/apache/skywalking/apm/agent/core/logging/core/AbstractLoggerTest.java	Added new test file with test cases for normal parameter replacement and the specific bug case with {} in replacement strings
CHANGES.md	Added changelog entry documenting the fix

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