[Doc] Remove cloud ingest (backport #54895)

[mergify]

We have duplicate content in the https://docs.starrocks.io/docs/loading/cloud_storage_load/ page and the pages under https://docs.starrocks.io/docs/loading/objectstorage/

Goal:

• Move the Tencent, Alicloud, and other sections from cloud_storage_load.md to the `objectstorage dir
• remove /cloud_storage_load from English and Chinese docs
• add redirects from cloud_storage_load to docs/loading/objectstorage

Redirects

An interesting feature added in this PR are redirects. By adding an entry to the docusaurus.config.js we can redirect from old URLs to new ones. We should only use this when making an important change (like if there are external blogs that point to a page). Here is the section from the config that redirects the old cloud_storage_load page to the objectstorage page:

  plugins: [
    [
      '@docusaurus/plugin-client-redirects',
      {
        redirects: [
          // /docs/oldDoc -> /docs/newDoc
          {
            from: '/docs/loading/cloud_storage_load/',
            to: '/docs/loading/objectstorage/'
          },
        ],
      },
    ],
  ],

Fixes #issue

What type of PR is this:

• BugFix
• Feature
• Enhancement
• Refactor
• UT
• Doc
• Tool

Does this PR entail a change in behavior?

• Yes, this PR will result in a change in behavior.
• No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

• Interface/UI changes: syntax, type conversion, expression evaluation, display information
• Parameter changes: default values, similar parameters but with different default values
• Policy changes: use new policy to replace old one, functionality automatically enabled
• Feature removed
• Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

• I have added test cases for my bug fix or my new feature
• This pr needs user documentation (for new or modified features or behaviors)
  • I have added documentation for my new feature or new function
• This is a backport pr

[mergify]

Cherry-pick of 5efdbcf has failed:

On branch mergify/bp/branch-3.1/pr-54895
Your branch is up to date with 'origin/branch-3.1'.

You are currently cherry-picking commit 5efdbcf7e9.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   docs/docusaurus/docusaurus.config.js
	modified:   docs/docusaurus/sidebars.json
	modified:   docs/en/loading/Etl_in_loading.md
	modified:   docs/en/loading/Load_to_Primary_Key_tables.md
	new file:   docs/en/loading/alibaba.md
	new file:   docs/en/loading/huawei.md
	new file:   docs/en/loading/s3_compatible.md
	new file:   docs/en/loading/tencent.md
	modified:   docs/zh/loading/Etl_in_loading.md
	modified:   docs/zh/loading/Load_to_Primary_Key_tables.md
	new file:   docs/zh/loading/alibaba.md
	new file:   docs/zh/loading/huawei.md
	new file:   docs/zh/loading/s3_compatible.md
	new file:   docs/zh/loading/tencent.md
	modified:   docs/zh/sql-reference/sql-statements/loading_unloading/BROKER_LOAD.md

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by them: docs/en/loading/cloud_storage_load.md
	both modified:   docs/zh/loading/Loading_intro.md
	deleted by them: docs/zh/loading/cloud_storage_load.md
	both modified:   docs/zh/sql-reference/sql-statements/cluster-management/nodes_processes/ALTER_SYSTEM.md
	both modified:   docs/zh/sql-reference/sql-statements/loading_unloading/SHOW_LOAD.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[mergify]

@mergify[bot]: Backport conflict, please reslove the conflict and resubmit the pr