chore(ci): set benchmarking jobs to be interruptible outside main (#15296)

## Description

<!-- Provide an overview of the change and motivation for the change -->

Set benchmarking jobs to be interruptible outside main.

https://datadoghq.atlassian.net/browse/APMSP-2369

## Testing

<!-- Describe your testing strategy or note what tests are included -->

The "test interruptibility" commit cancels both microbenchmarking and
macrobenchmarking jobs:
https://gitlab.ddbuild.io/DataDog/apm-reliability/dd-trace-py/-/pipelines?ref=augusto.deoliveira%2Fapmsp-2369.ensure-correct-interrupt-policy

## Risks

<!-- Note any risks associated with this change, or "None" if no risks
-->

None.

## Additional Notes

<!-- Any other information that would be helpful for reviewers -->

Author: igoragoli

.gitlab/benchmarks/macrobenchmarks.yml

@@ -17,6 +17,10 @@ candidate:
   image: $PACKAGE_IMAGE
   stage: build
   tags: [ "arch:amd64" ]
+  rules:
+    - if: $CI_COMMIT_BRANCH == "main" || $CI_COMMIT_BRANCH =~ /^[0-9]+\.[0-9]+$/
+      interruptible: false
+    - interruptible: true
   needs:
     - pipeline: $PARENT_PIPELINE_ID
       job: download_ddtrace_artifacts
@@ -33,6 +37,10 @@ candidate:
   stage: test
   needs: [ "candidate" ]
   tags: ["runner:apm-k8s-same-cpu"]
+  rules:
+    - if: $CI_COMMIT_BRANCH == "main" || $CI_COMMIT_BRANCH =~ /^[0-9]+\.[0-9]+$/
+      interruptible: false
+    - interruptible: true
   timeout: 1h
   retry:
     max: 2

.gitlab/benchmarks/microbenchmarks.yml

@@ -16,7 +16,10 @@ variables:
   when: on_success
   tags: ["runner:apm-k8s-tweaked-metal"]
   image: $MICROBENCHMARKS_CI_IMAGE
-  interruptible: true
+  rules:
+    - if: $CI_COMMIT_BRANCH == "main" || $CI_COMMIT_BRANCH =~ /^[0-9]+\.[0-9]+$/
+      interruptible: false
+    - interruptible: true
   timeout: 30m
   dependencies: [ "baseline:build", "candidate" ]
   script: |