[8.14] [Response Ops][Alerting] Fixing bug with agg building for ES query rule when there are multi-terms and a group by field (#182865)

[kibanamachine]

Backport

This will backport the following commits from main to 8.14:

• [Response Ops][Alerting] Fixing bug with agg building for ES query rule when there are multi-terms and a group by field (#182865)

Questions ?

Please refer to the Backport tool documentation

[kibana-ci]

:yellow_heart: Build succeeded, but was flaky

• Buildkite Build
• Commit: 59cf29c362758d8d6929bd687c62d5c121c51370

Failed CI Steps

• FTR Configs #4

Test Failures

• [job] [logs] FTR Configs #4 / saved objects tagging - functional tests dashboard integration creating allows to select tags for a new dashboard

Metrics [docs]

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
triggersActionsUi	120.8KB	121.0KB	+230.0B

To update your PR or re-run it, just comment with: @elasticmachine merge upstream

cc @ymao1