feat: dd-trace 5.0 to 6.0 - rename profiling experimental env vars

[mohab-sameh]

Summary

Rename removed profiling env var aliases by dropping _EXPERIMENTAL_.

Detection Criteria

Detect these env vars in source and supported config formats:

• DD_PROFILING_EXPERIMENTAL_CODEHOTSPOTS_ENABLED
• DD_PROFILING_EXPERIMENTAL_CPU_ENABLED
• DD_PROFILING_EXPERIMENTAL_ENDPOINT_COLLECTION_ENABLED
• DD_PROFILING_EXPERIMENTAL_TIMELINE_ENABLED

Transformation Logic

Rename each to the canonical name without _EXPERIMENTAL_.

Before / After Example

process.env.DD_PROFILING_EXPERIMENTAL_CPU_ENABLED = "true";

process.env.DD_PROFILING_CPU_ENABLED = "true";

Notes / Edge Cases

Implemented for JS/TS source contexts. The package workflow also has a gated
AI config step for exact active occurrences in .env, YAML, Dockerfile, shell,
CI, and deployment files.