Revert "oblt: support github command for serverless" (elastic#158349)

Reverts elastic#158237

.github/workflows/deploy-my-kibana.yml

@@ -2,7 +2,7 @@
 ##
 ## This the automation to let Observability team members to deploy a Kibana instance
 ## using the Observability test environments.
-## It will deploy a new instance for those who add a comment /oblt-deploy or /oblt-deploy-serverless
+## It will deploy a new instance for those who add a comment /oblt-deploy
 ## only supported for Elasticians.
 ##
 ## Owner: @elastic/observablt-robots
@@ -28,15 +28,3 @@ jobs:
           vaultUrl: ${{ secrets.OBLT_VAULT_ADDR }}
           vaultRoleId: ${{ secrets.OBLT_VAULT_ROLE_ID }}
           vaultSecretId: ${{ secrets.OBLT_VAULT_SECRET_ID }}
-          serverless: false
-
-  deploy-my-kibana-serverless:
-    if: ${{ github.event.issue.pull_request && github.event.comment.body == '/oblt-deploy-serverless'}}
-    runs-on: ubuntu-latest
-    steps:
-      - uses: elastic/apm-pipeline-library/.github/actions/deploy-my-kibana@current
-        with:
-          vaultUrl: ${{ secrets.OBLT_VAULT_ADDR }}
-          vaultRoleId: ${{ secrets.OBLT_VAULT_ROLE_ID }}
-          vaultSecretId: ${{ secrets.OBLT_VAULT_SECRET_ID }}
-          serverless: true

.github/workflows/oblt-github-commands.yml

@@ -50,7 +50,6 @@ jobs:
 
               Just comment with:
               - \`/oblt-deploy\` : Deploy a Kibana instance using the Observability test environments.
-              - \`/oblt-deploy-serverless\` : Deploy a Kibana instance using the Observability `serverless` test environment [only for main].
               - \`run\` \`elasticsearch-ci/docs\` : Re-trigger the docs validation. (use unformatted text in the comment!)
 
               </p>