Feature: add asf.yaml for Cloudberry under ASF

[tuhaihe]

fix #ISSUE_Number

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Change logs

Following the Apache request to set the apache/cloudberry repo configurations in the new file .asf.yaml, including notifications, tags, branch protection policy, merge buttons, and other repo metadata.

Why are the changes needed?

Meet the ASF requirement.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Please detail how the changes were tested, including manual tests and any relevant unit or integration tests.

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• Document changes.
• Add tests for the change
• Pass make installcheck
• Pass make -C src/test installcheck-cbdb-parallel
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[CLAassistant]

All committers have signed the CLA.

[tuhaihe]

Once the repo is transferred to the ASF, we can merge this PR.

[edespino]

I suggest we remove the required_status_checks section for now.