[#12795] improvement(infra): Enable automatic GitHub Copilot code review

[nevzheng]

What changes were proposed in this pull request?

Enable automatic GitHub Copilot review on non-draft pull requests targeting main, and document that people should add Copilot. That is recommended, not required.

.asf.yaml adds the ASF convenience block:

• enabled: true — create the Copilot Code Review ruleset on the default branch
• review_drafts: false — skip drafts; first auto-review when marked ready
• review_on_push: false — do not re-review on later pushes; add Copilot by hand after updates

CONTRIBUTING.md asks authors and reviewers to add Copilot, and to add it again after later pushes. Copilot is a first pass, not a gate. .github/copilot-instructions.md is unchanged.

The full contract (what this does and does not do, billing, capabilities, limitations) is in #12795.

Why are the changes needed?

Copilot can already review when someone requests it. Automatic first-pass review needs the ASF .asf.yaml ruleset. Iceberg, Arrow, and other ASF projects already run this.

Fix: #12795

Does this PR introduce any user-facing change?

No runtime, API, or property-key change. After merge, authors with Copilot code-review access can get an automatic first pass when the PR is marked ready. Later pushes do not re-review unless someone adds Copilot. Waiting for Copilot is recommended, not required. Required human approval stays 1.

How was this patch tested?

• Parsed .asf.yaml as YAML (ruby -ryaml)
• git diff --check passed
• Automatic Copilot review can only be confirmed after merge, when ASF Infra applies the ruleset

Nevin
Sent from my 🤖 (Cursor)

[nevzheng]

Updating the proposal: review_on_push: false so Copilot auto-reviews once when the PR is marked ready, not on every push. CONTRIBUTING now asks people to add Copilot (and to add it again after later pushes). Copilot-before-human stays recommended, not required.

Nevin
Sent from my 🤖 (Cursor)

[github-actions]

Code Coverage Report

Overall Project	68.91%	🟢
Files changed	No Java source files changed	-

Module	Coverage
aliyun	19.74%	🔴
api	51.72%	🟢
authorization-common	85.96%	🟢
authorization-ranger	4.38%	🔴
aws	53.54%	🟢
azure	32.1%	🔴
catalog-common	19.1%	🔴
catalog-fileset	80.3%	🟢
catalog-glue	69.24%	🟢
catalog-hive	82.96%	🟢
catalog-jdbc-common	45.69%	🟢
catalog-jdbc-doris	82.69%	🟢
catalog-jdbc-mysql	79.33%	🟢
catalog-jdbc-postgresql	83.39%	🟢
catalog-jdbc-starrocks	79.16%	🟢
catalog-kafka	76.99%	🟢
catalog-lakehouse-generic	60.55%	🟢
catalog-lakehouse-hudi	79.1%	🟢
catalog-lakehouse-iceberg	85.86%	🟢
catalog-lakehouse-paimon	84.26%	🟢
catalog-model	77.99%	🟢
cli	44.48%	🟢
client-java	77.49%	🟢
common	55.96%	🟢
core	83.87%	🟢
filesystem-hadoop3	76.45%	🟢
flink	0.0%	🔴
flink-common	52.1%	🟢
flink-runtime	0.0%	🔴
gcp	32.2%	🔴
hadoop-auth	68.0%	🟢
hadoop-common	17.84%	🔴
hive-metastore-common	53.4%	🟢
iceberg-aliyun-bundle	0.0%	🔴
iceberg-common	64.75%	🟢
iceberg-rest-server	75.89%	🟢
idp-basic	85.98%	🟢
integration-test-common	0.0%	🔴
jobs	62.92%	🟢
lance-common	32.63%	🔴
lance-rest-server	65.46%	🟢
lineage	53.02%	🟢
optimizer	83.24%	🟢
optimizer-api	21.95%	🔴
server	88.33%	🟢
server-common	80.5%	🟢
spark	28.57%	🔴
spark-common	48.92%	🟢
tencent	81.78%	🟢
trino-connector	51.26%	🟢

[bharos]

LGTM