dbt: set anonymous usage stats and colors to false via env vars

[JuFrei]

Summary

• A previous PR removed the send_anonymous_usage_stats and use_colors configurations from the profiles.yml config block since the configuration is outdated and may clash with newer dbt versions.
• These settings are now passed as environment variables (DBT_SEND_ANONYMOUS_USAGE_STATS, DBT_USE_COLORS) so dbt still picks them up without relying on the deprecated profiles.yml config section.

[gemma-claude-assistant]

Review: PR #320

This PR sets two dbt environment variables in EWAHDBTOperator.execute():

• DBT_SEND_ANONYMOUS_USAGE_STATS=False — suppresses dbt telemetry network calls during operator execution. Good practice for a pipeline operator.
• DBT_USE_COLORS=False — strips ANSI escape codes from dbt log output, keeping Airflow logs clean.

Both changes follow the existing code pattern and have no bugs, security issues, or style violations. Approved.

[gemma-claude-assistant]

Claude review cost: $0.0964 · 4 turns · 25s · eu.anthropic.claude-sonnet-4-6

[PascalCrow]

Request (blocking): ewah Version bump is missing,

[gemma-claude-assistant]

This PR makes two small quality-of-life improvements to the dbt operator's subprocess environment:

• Disables dbt anonymous usage stats (DBT_SEND_ANONYMOUS_USAGE_STATS=False) — removes outbound telemetry calls during dbt runs.
• Disables ANSI color output (DBT_USE_COLORS=False) — keeps Airflow logs clean and easier to parse.

Both variables are set on the local env copy (via os.environ.copy()), so they don't affect the Airflow process itself. Change is correct, safe, and follows repo conventions. VERSION bump to 0.9.28 is appropriate. Approved.

[gemma-claude-assistant]

Claude review cost: $0.0967 · 4 turns · 22s · eu.anthropic.claude-sonnet-4-6

[PascalCrow]

LGTM, thanks!