Tidy up python build script before 314 upgrade

[ryanking13]

Another split PR from #6683, this PR includes a few cleanups that are not directly related to 314 version up.

• Set 0.28.2 version as released.
• Fix esbuild script to find the correct Pyodide directory using the version number
• Update snapshot generation script to not output the numpy and fastapi snapshot anymore, regarding that we will drop supporting built-in packages.
• Removed numpy dependency from a few unittests that does not require numpy.

[ask-bonk]

I'm Bonk, and I've done a quick review of your PR.

This PR tidies up the Python build scripts: marks 0.28.2 as released, fixes esbuild config to use the version directly via template substitution instead of scanning directories, removes numpy/fastapi snapshot generation, and drops unused numpy requirements from tests.

1. [LOW] readdirSync is now unused in src/pyodide/internal/pool/esbuild.config.mjs:2 after the directory-scanning logic was replaced with direct version substitution. The import can be cleaned up:

import { existsSync } from 'node:fs';

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This review was generated by an AI assistant and may contain inaccuracies.

[ask-bonk]

I'm Bonk, and I've done a quick review of your PR.

This PR tidies up the Python build scripts: marks 0.28.2 as released, fixes esbuild config to use the version directly via template substitution instead of scanning directories, removes numpy/fastapi snapshot generation, and drops unused numpy requirements from tests.

One minor issue found:

1. [LOW] readdirSync is now unused in src/pyodide/internal/pool/esbuild.config.mjs:2 after the directory-scanning logic was replaced with direct version substitution. The import can be removed.

Comment posted: #6694 (comment)

github run

[dom96]

Looks good, thanks!