Tune OpenAPI linters

[lcawl]

This PR switches the linter that is used to check the OpenAPI files to match what we're using in the Kibana repo.
It also turns off some lint checks that were generating noise and fixes two examples that were generating errors.

[github-actions]

Following you can find the validation results for the APIs you have changed.

API	Status	Request	Response
ccr.forget_follower	⚪	Missing test	Missing test
ml.delete_model_snapshot	🟢	2/2	2/2

You can validate these APIs yourself by using the make validate target.

[szabosteve]

LGTM!

[github-actions]

The backport to 8.x 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.x 8.x
# Navigate to the new working tree
cd .worktrees/backport-8.x
# Create a new branch
git switch --create backport-3704-to-8.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 d1b88afba8ff22e761dd74d4dbccf4382bf3ca25
# Push it to GitHub
git push --set-upstream origin backport-3704-to-8.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-8.x

Then, create a pull request where the base branch is 8.x and the compare/head branch is backport-3704-to-8.x.

[github-actions]

The backport to 8.18 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-8.18 8.18
# Navigate to the new working tree
cd .worktrees/backport-8.18
# Create a new branch
git switch --create backport-3704-to-8.18
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 d1b88afba8ff22e761dd74d4dbccf4382bf3ca25
# Push it to GitHub
git push --set-upstream origin backport-3704-to-8.18
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-8.18

Then, create a pull request where the base branch is 8.18 and the compare/head branch is backport-3704-to-8.18.

[lcawl]

💚 All backports created successfully

Status	Branch	Result
✅	8.x

Questions ?

Please refer to the Backport tool documentation

[lcawl]

💚 All backports created successfully

Status	Branch	Result
✅	8.18

Questions ?

Please refer to the Backport tool documentation

[lcawl]

💚 All backports created successfully

Status	Branch	Result
✅	8.17

Questions ?

Please refer to the Backport tool documentation