Improve build-scripts

[Blargian]

Summary

• replaces prep-from-local, 'prep-from-master' and copyClickhouseRepoDocs.sh with a single script scripts/copy-clickhouse-repo-docs.sh which performs old prep-from-master by default or can perform prep-from-local if you provide it arg -l.
• copy-clickhouse-repo-docs.sh additionally copies files needed for any kind of autogeneration (changelog and settings generation) to settings/tmp. New files can be added to package.json "autogen_needed_files" to extend.
• copy-clickhouse-repo-docs.sh uses rsync, falls back to cp if it cannot find rsync
• Moves logic for generating changelog to own script.

To do:

• get rid of "new-build" and have just build
• add linter for python and bash from the main repo

Checklist

• Delete items not relevant to your PR
• URL changes should add a redirect to the old URL via https://github.com/ClickHouse/clickhouse-docs/blob/main/docusaurus.config.js
• If adding a new integration page, also add an entry to the integrations list here: https://github.com/ClickHouse/clickhouse-docs/blob/main/docs/en/integrations/index.mdx

[Blargian]

Okay, i'm not crazy: https://stackoverflow.com/questions/68636358/file-not-found-in-alpine-container-despite-existing https://stackoverflow.com/questions/66963068/docker-alpine-executable-binary-not-found-even-if-in-path

Seems to be an underlying reason why no matter what I try I cannot run the clickhouse binary in the docs build (we just never picked this up because there was zero error handling in the original autogenerate-settings script, so it just always printed "Successfully generated settings" LOL

#75397

[Blargian]

@gingerwizard ready for review on this. I think I know why we have "new-build".

here we pass arg "/output_path/build":

https://github.com/ClickHouse/ClickHouse/blob/0bfda2c21d37fdc82a9bff9ccadade7fe66e4d63/tests/ci/docs_check.py#L123

This is passed as an argument to yarn build which is just docusaurus build in package.json:

clickhouse-docs/package.json

Line 10 in 2060b8d

"build": "docusaurus build",

If I try change yarn build to new-build which calls build-swagger at the end of it then the docs build fails because /output_path/build is getting passed as an argument to build-swagger which then fails because it is not expecting this argument.

When we remove htmltest we'll be able to put everything in new-build into build. For now build needs to stay separate.

[Blargian]

Need to fix broken links in settings first: ClickHouse/ClickHouse#75524

and URLs: ClickHouse/ClickHouse#75549

and broken hashes: ClickHouse/ClickHouse#75637