ci: optimize pull request checks

[bladehan1]

What does this PR do?

• Remove four invocation-wide --no-build-cache flags from Debian and Coverage Base builds and RocksDB tests.
• Recommend type(scope): description while tolerating the common omission of its single space; multiple spaces and other whitespace remain invalid.
• Route a bare ci: description title to the existing ci reviewer scope; explicit scopes still take precedence and other bare types retain default reviewers.
• Remove two tracked 0-byte Java placeholder files from chainbase.

Why are these changes required?

The repository already enables Gradle Build Cache. However, four x86 Gradle invocations disable task-output cache reads and writes globally. Removing those flags enables reuse for eligible compile, package, Checkstyle, and test tasks.

CONTRIBUTING.md permits both scoped and bare PR titles. Since ci is also an existing reviewer scope, a bare ci type can be mapped without inventing mappings for unrelated types.

This PR has been tested by:

• YAML AST parsing for .github/workflows/pr-build.yml, .github/workflows/pr-check.yml, and .github/workflows/pr-reviewer.yml
• Positive and negative PR-title regular-expression cases
• Reviewer extraction cases for explicit scopes, bare ci, and other bare types
• Verification that the four x86 commands no longer contain --no-build-cache
• git diff --check
• Forced local execution without task-cache reuse: ./gradlew -g /private/tmp/java-tron-gradle-home :framework:checkstyleMain :framework:checkstyleTest :plugins:checkstyleMain --no-daemon --no-build-cache
• Local :framework:testWithRocksDb clean/restore validation: stable task key and successful FROM-CACHE restoration

Follow up

• Change a task-relevant input and confirm that Gradle executes the affected task instead of returning FROM-CACHE.
• Use task-specific --rerun if a future test contract requires real execution for every CI run.

Extra details

• clean removes project build/ output but does not remove $GRADLE_USER_HOME/caches/build-cache-1; eligible outputs can therefore be restored after clean.
• This PR does not change node runtime, consensus, state, database, RPC, configuration, or protocol behavior.

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