GA Migration Website Publish and Test

[roger-mike]

As part of the migration of Precommit and Postcommit Jobs from Jenkins to GA in self-hosted runners, this PR contains:

• Migrated and sharded workflow job-postcommit-website-publish.yml
• Migrated and sharded workflow job-postcommit-website-test.yml

The migrated workflows were added to CI.md

DO NOT MERGE until the effort to use self-hosted runners is completed #22703
These workflows use base actions listed in #23109 (Dependency)

---

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