Add explanatory comments to @SuppressWarnings for ErrorProne 2.44.0

[Copilot]

Fix #4535.

ErrorProne 2.44.0 introduces SuppressWarningsWithoutExplanation check requiring all @SuppressWarnings annotations to include comments explaining why the suppression is justified.

Changes

Added explanatory comments to 159 @SuppressWarnings annotations across 101 files:

• unchecked casts (15): Safe cast verified by runtime context
• Java8ApiChecker (3): JFR requires Java 11+, agent targets Java 8 bytecode
• checkstyle:AbbreviationAsWordInName (14): CGroup is standard abbreviation
• SystemOut (21): Legitimate console output for agent/test initialization
• unused (31): Required by API signature or framework contract
• Various others (75): Context-specific justifications

Example

// Before
@SuppressWarnings("unchecked")
public Telemetry setTelemetry(Object telemetry) {

// After  
@SuppressWarnings("unchecked") // safe unchecked cast - type verified by runtime context
public Telemetry setTelemetry(Object telemetry) {

For significant contributions please make sure you have completed the following items:

• Design discussion issue #
• Changes in public surface reviewed
• CHANGELOG.md updated

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• checkstyle.org
  • Triggering command: /opt/hostedtoolcache/CodeQL/2.23.3/x64/codeql/tools/linux64/java/bin/java -jar /opt/hostedtoolcache/CodeQL/2.23.3/x64/codeql/xml/tools/xml-extractor.jar --fileList=/home/REDACTED/work/ApplicationInsights-Java/.codeql-scratch/dbs/java/working/files-to-index5721747565749026607.list --sourceArchiveDir=/home/REDACTED/work/ApplicationInsights-Java/.codeql-scratch/dbs/java/src --outputDir=/home/REDACTED/work/ApplicationInsights-Java/.codeql-scratch/dbs/java/trap/java (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Fix GitHub Action failures in #4535 by adding a comment describing why the warning is safe to ignore for each @SupressWarnings.

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