Revert "Add Connector API (#2531)"

[pquentin]

This reverts commit dd6c015. This API will not be part of elasticsearch-py 8.14.

[github-actions]

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[github-actions]

The backport to 8.14 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-8.14 8.14
# Navigate to the new working tree
cd .worktrees/backport-8.14
# Create a new branch
git switch --create backport-2553-to-8.14
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 be7223ce4d714fc975200cca0f8c1778bb84ed4b
# Push it to GitHub
git push --set-upstream origin backport-2553-to-8.14
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-8.14

Then, create a pull request where the base branch is 8.14 and the compare/head branch is backport-2553-to-8.14.