Add reuse_cluster parameter to Jenkins pipelines. When set to an existing test ID, pipeline reuses the original SCT runner and skips provisioning.

Closes: SCT-138

Testing

• 🟢 AWS cluster resuse
  initial run
  reuse of the cluster, but post_behavior is still keep
  reuse of the cluster, post_behavior is destroy - cluster is deleted

07:17:07  Going to delete 'i-09044b37c2731d86e' [name=PR-provision-test-reuse-cl-db-node-c7eca701-3] 
07:17:08  Going to delete 'i-0d5f02c815a39ab0a' [name=PR-provision-test-reuse-cl-db-node-c7eca701-2] 
07:17:09  Going to delete 'i-0bca8e1d7b05d54f0' [name=PR-provision-test-reuse-cl-db-node-c7eca701-1] 
07:17:10  Going to delete 'i-0a82c9c48b06012e8' [name=PR-provision-test-reuse-cl-monitor-node-c7eca701-1] 
07:17:10  Going to delete 'i-0dc1b6dde4ccd4265' [name=PR-provision-test-reuse-cl-loader-node-c7eca701-1] 

• 🟢 GCE cluster resuse
  initial run
  reuse of the cluster
• 🟢 Azure cluster resuse
  initial run
  reuse of the cluster

PR pre-checks (self review)

• I added the relevant backport labels
• I didn't leave commented-out/debugging code

Reminders

• Add New configuration option and document them (in sdcm/sct_config.py)
• Add unit tests to cover my changes (under unit-test/ folder)
• Update the Readme/doc folder relevant to this change (if needed)