[EP Perf] Fix on EP Perf (#20683)
### Description
<!-- Describe your changes. -->
* Partially revert [previous
change](https://github.com/microsoft/onnxruntime/pull/19804), and
* Redo concurrency_test_result parser outside of post.py
* Add support of syncing memtest result to db
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
To fix the error when CI is running on two model groups.
- When running on two model groups, the [previous
change](https://github.com/microsoft/onnxruntime/pull/19804) wrongly
navigates two levels up in the directory after running one model group,
while one level is needed. After that, the script can't find another
model group.
- Running on one model group can't repro the issue
