[8.19] Update publish_oas_docs.sh for 8.19 (#229198) (#229885)

# Backport

This will backport the following commits from `main` to `8.19`:
- [Update publish_oas_docs.sh for 8.19
(#229198)](#229198)

<!--- Backport version: 9.6.6 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

<!--BACKPORT [{"author":{"name":"Lisa
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publish_oas_docs.sh for 8.19 (#229198)\n\n## Summary\n\nThis PR stops
pushing the OpenAPI document from the 8.18 branch to our\nAPI docs
publishing site.\nInstead, the \"v8\" API docs will be derived from the
8.19 branch.\n\nNOTE: This PR must be merged only when 8.19 goes
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publish_oas_docs.sh for 8.19 (#229198)\n\n## Summary\n\nThis PR stops
pushing the OpenAPI document from the 8.18 branch to our\nAPI docs
publishing site.\nInstead, the \"v8\" API docs will be derived from the
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publish_oas_docs.sh for 8.19 (#229198)\n\n## Summary\n\nThis PR stops
pushing the OpenAPI document from the 8.18 branch to our\nAPI docs
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BACKPORT-->

Co-authored-by: Lisa Cawley <[email protected]>
Co-authored-by: George Wallace <[email protected]>

Author: 3 people

.buildkite/scripts/steps/openapi_publishing/publish_oas_docs.sh

@@ -54,13 +54,6 @@ if [[ "$BUILDKITE_BRANCH" == "9.0" ]]; then
 fi
 
 if [[ "$BUILDKITE_BRANCH" == "8.19" ]]; then
-  BUMP_KIBANA_DOC_NAME="$(vault_get kibana-bump-sh kibana-doc-name)"
-  BUMP_KIBANA_DOC_TOKEN="$(vault_get kibana-bump-sh kibana-token)"
-  deploy_to_bump "$(pwd)/oas_docs/output/kibana.yaml" $BUMP_KIBANA_DOC_NAME $BUMP_KIBANA_DOC_TOKEN 8x-unreleased;
-  exit 0;
-fi
-
-if [[ "$BUILDKITE_BRANCH" == "8.18" ]]; then
   BUMP_KIBANA_DOC_NAME="$(vault_get kibana-bump-sh kibana-doc-name)"
   BUMP_KIBANA_DOC_TOKEN="$(vault_get kibana-bump-sh kibana-token)"
   deploy_to_bump "$(pwd)/oas_docs/output/kibana.yaml" $BUMP_KIBANA_DOC_NAME $BUMP_KIBANA_DOC_TOKEN v8;