Test example code snippets before mkdocs build

[ShahanaFarooqui]

This PR updates the CI workflow to run and verify Python and Rust example snippets before building the documentation with mkdocs. The goal is to ensure that any documentation examples included in the site are functional and up-to-date, preventing broken snippets from being published.

[ShahanaFarooqui]

It is current throwing signer version 25.05 missing error.

| Error: status: Cancelled, message: "(<class 'ValueError'>, ValueError(\"No node_version found for n.signer_version=SignerVersion(name='v25.05')\"), <traceback object at 0x7a26a03fbf80>)", details: [], metadata: MetadataMap { headers: {"content-type": "application/grpc+proto"} }
| ValueError: error calling remote method: status: Cancelled, message: "(<class 'ValueError'>, ValueError(\"No node_version found for n.signer_version=SignerVersion(name='v25.05')\"), <traceback object at 0x7c13d5fdd1c0>)", details: [], metadata: MetadataMap { headers: {"content-type": "application/grpc+proto"} }