GA migration Postcommit Python Sickbay

[benEng]

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

• Migrated workflow job-postcommit-python-sickbay.yml

The migrated workflows were removed from .test-infra/jenkins/README.md and added to CI.md

DO NOT MERGE until the effort to use self-hosted runners is completed #22703

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[benEng]

Failed correctly executions on self-hosted runners:

Sickbay 3.7, 3.8, 3.9: https://github.com/benWize/beam/actions/runs/3041163675

[fernando-wizeline]

LGTM!

[github-actions]

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[damccorm]

As mentioned in other PRs, please make this part of a single table

[benEng]

Done!

[github-actions]

Reminder, please take a look at this pr: @damccorm

[damccorm]

LGTM

[github-actions]

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