Add braces for ControlStatementBraces PMD rule; fail-on-ControlStatementBraces and exclude LooseCoupling

[shai-almog]

Motivation

• Bring source into compliance with PMD ControlStatementBraces by ensuring all control statements use braces to avoid fragile single-line conditionals.
• Tighten quality gating so future PMD ControlStatementBraces violations fail the quality check while excluding LooseCoupling which is not appropriate for this codebase.

Description

• Added explicit braces to single-line control statements across the codebase (many files under CodenameOne/src/...), fixing PMD ControlStatementBraces violations (examples: VideoCaptureConstraints, ChartComponent, XYSeries, Deflate, ColorUtil, XYChart, ImageViewer, AsyncResource, and many more).
• Updated the core unit-tests PMD ruleset maven/core-unittests/pmd.xml to exclude the LooseCoupling rule.
• Updated the quality gating script .github/scripts/generate-quality-report.py to add ControlStatementBraces to the set of forbidden PMD rules so violations will cause the quality report to fail the build.
• Minor related cleanups where required to preserve semantics when adding braces (e.g. small formatting adjustments, and a corrected return-brace in AsyncResource.isCancelled).

Testing

• No automated tests were executed in this change; only code edits and the quality-report/script updates were applied locally.
• Recommended verification: run the core unit tests and generate quality reports with the Maven command from AGENTS.md: cd maven && mvn clean verify -DunitTests=true -pl core-unittests -am -Dmaven.javadoc.skip=true -Plocal-dev-javase to ensure PMD/SpotBugs checks and unit tests pass.

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Codex Task