fix(plugin-base): short-circuit cached selector and rule matches

[Aias00]

Summary

• reuse cached selector matches in AbstractShenyuPlugin instead of re-running default selector matching on a cache hit
• reuse cached rule matches on a cache hit while preserving the existing empty-sentinel fallback behavior
• add AbstractShenyuPluginTest coverage for selector-cache-hit and rule-cache-hit short-circuit paths

Test Plan

• ./mvnw -q -pl shenyu-plugin/shenyu-plugin-base -am -Dtest=AbstractShenyuPluginTest -DfailIfNoTests=false -DskipITs -Drat.skip=true -Djacoco.skip=true -Dcheckstyle.skip=true -Dspotbugs.skip=true test

[Copilot]

Pull request overview

This PR optimizes the shenyu-plugin-base execution path by actually reusing selector/rule match results from MatchDataCache on cache hits (instead of re-running the default matching logic), and adds unit tests to cover the new short-circuit paths.

Changes:

• Short-circuit selector matching when a non-empty cached selector hit is present.
• Short-circuit rule matching when a non-empty cached rule hit is present (while preserving the existing empty-sentinel behavior).
• Add unit tests for selector/rule cache-hit short-circuit paths; update .gitignore to ignore local worktrees.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
shenyu-plugin/shenyu-plugin-base/src/main/java/org/apache/shenyu/plugin/base/AbstractShenyuPlugin.java	Reuses cached selector/rule matches to avoid re-running default matching on cache hits.
shenyu-plugin/shenyu-plugin-base/src/test/java/org/apache/shenyu/plugin/base/AbstractShenyuPluginTest.java	Adds coverage for selector/rule cache-hit short-circuit behavior.
.gitignore	Ignores .worktrees/ directory used for local worktrees.

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[moremind]

merge the condition