Remove obsolete scalardb-analytics-postgresql-sample

[choplin]

Description

Remove the scalardb-analytics-postgresql-sample directory as it is no longer needed.

Related issues and/or PRs

We already removes the related page from the documentation site in https://github.com/scalar-labs/docs-internal-scalardb/pull/1706

Changes made

• Remove scalardb-analytics-postgresql-sample/ directory entirely

Checklist

• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation to reflect the changes.
• Any remaining open issues linked to this PR are documented and up-to-date (Jira, GitHub, etc.).
• Tests (unit, integration, etc.) have been added for the changes.
• My changes generate no new warnings.
• Any dependent changes in other PRs have been merged and published.

Additional notes (optional)

None

[Copilot]

Pull request overview

This PR removes the obsolete scalardb-analytics-postgresql-sample directory from the repository. The removal is part of a cleanup effort, as the related documentation was already removed in a previous PR (scalar-labs/docs-internal-scalardb#1706). The change ensures consistency between the code samples and documentation.

• Complete removal of the scalardb-analytics-postgresql-sample directory
• No remaining references to this sample in the codebase or CI configuration
• Aligns with documentation cleanup already completed

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[komamitsu]

LGTM! 👍

[brfrn169]

LGTM! Thank you!

[feeblefakie]

LGTM! Thank you!