fix: drop all python embedding code for docker and doc

[yihong0618]

I hereby agree to the terms of the GreptimeDB CLA.

Since all python feature had been dropped from #5321
Docker side and requirements can be drop too, also drop rustpython mention in doc.

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Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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