GEODE-10570: Replace 2.0.0 with 2.0.1 as old version (#7997)

Replace 2.0.0 with 2.0.1 in old versions and set as default Benchmarks baseline on develop
to enable rolling upgrade tests from 2.0.1

The serialization version has not changed between 2.0.0 and 2.0.1,
so there should be no need to keep both

ci/pipelines/shared/jinja.variables.yml

diff --git a/ci/pipelines/shared/jinja.variables.yml b/ci/pipelines/shared/jinja.variables.yml
index a5d455a..c7ba456 100644
--- a/ci/pipelines/shared/jinja.variables.yml
+++ b/ci/pipelines/shared/jinja.variables.yml
@@ -17,7 +17,7 @@
 
 benchmarks:
   baseline_branch_default: ''
-  baseline_version_default: '1.15.1'
+  baseline_version_default: '2.0.1'
   benchmark_branch: ((geode-build-branch))
   flavors:
   - title: 'base'