Removing already existing vendor repo

[dennycjacob]

While running Perf_Pipeline , the runs were failing because of this error:

+ git clone -q --depth 1 -b main git@github.ibm.com:runtimes/rt-performance.git vendorRepo
fatal: destination path 'vendorRepo' already exists and is not an empty directory.
[Pipeline] }

https://hyc-runtimes-jenkins.swg-devops.com/job/Perf_Pipeline_JDK21/416/console

Added a step to remove the vendor repo before cloning.

[dennycjacob]

Perf_Pipeline is now running after the changes:
https://hyc-runtimes-jenkins.swg-devops.com/job/Perf_Pipeline_JDK21/420/

[sophia-guo]

This is workspace pollution. Instead of removing this specific directory, cleanWs step should be added to two node blocks.

To verify we need to run the job on same agents.

incorrect PR