Bodobolero/pgbench compare azure (#8409)

## Problem

We want to run performance tests on all supported cloud providers.
We want to run most tests on the postgres version which is default for
new projects in production, currently (July 24) this is postgres version
16

## Summary of changes

- change default postgres version for some (performance) tests to 16
(which is our default for new projects in prod anyhow)
- add azure region to pgbench_compare jobs

- add azure region to pgvector benchmarking jobs
- re-used project `weathered-snowflake-88107345` was prepared with 1
million embeddings running on 7 minCU 7 maxCU in azure region to compare
with AWS region (pgvector indexing and hnsw queries)
  - see job pgbench-pgvector 

- Note we now have a 11 environments combinations where we run
pgbench-compare and 5 are for k8s-pod (deprecated) which we can remove
in the future once auto-scaling team approves.

## Logs

A current run with the changes from this pull request is running here
https://github.com/neondatabase/neon/actions/runs/9972096222

Note that we currently expect some failures due to
- https://github.com/neondatabase/neon/issues/8275
- instability of projects on azure region

.github/actions/neon-project-create/action.yml

@@ -9,8 +9,8 @@ inputs:
     description: 'Region ID, if not set the project will be created in the default region'
     default: aws-us-east-2
   postgres_version:
-    description: 'Postgres version; default is 15'
-    default: '15'
+    description: 'Postgres version; default is 16'
+    default: '16'
   api_host:
     description: 'Neon API host'
     default: console-stage.neon.build