dry run mode for --jira-ticket parmeter in paasta spark-run

[sidsatyelp]

What this change does

1. Extracts the jira_ticket handling to a separate private method. We still run all tests through the public interface get_spark_conf()
2. Adds a yelp-clog requirement to tox that is conditionally installed.
3. When flag spark.yelp.jira_ticket.enabled is false in srv-configs, it logs a warning to monk with the user param passed to get_spark_conf(). Ensures that paasta validate and paasta m-f-d work as usual.
4. When the flag is true, it will block non-exempt users
5. Add jenkins to allowed users list (Proof that this user is indeed called jenkins)

Testing

When flag is disabled

# should launch with no warning but write to monk
paasta spark-run --aws-profile=dev-cloud-economics --cmd "spark-submit /code/integration_tests/s3.py"
# output: https://fluffy.yelpcorp.com/i/xZstCSFXx0L4sKBQnThv2p42DnC7vMZn.html

scribereader -e devc spark_jira_ticket -n 100
{"timestamp": 1749771624, "event": "jira_ticket_validation_warning", "level": "WARNING", "reason": "Ticket missing or invalid", "user": "sids", "jira_ticket_provided": "BLAH-sids", "paasta_cluster": "pnw-devc-spark", "paasta_service": "spark", "paasta_instance": "adhoc_sids_spark-submit"}

# should launch with labels attached to pods
paasta spark-run --aws-profile=dev-cloud-economics --jira-ticket=CLOUD-802 --cmd "spark-submit /code/integration_tests/s3.py"
# output: https://fluffy.yelpcorp.com/i/kLSxKxmtk2qB10mh2TTm123ZSHkCh8KN.html

# paasta validate works
╰─ paasta validate -y ~/repos/yelpsoa-configs -s spark
✓ Successfully validated schema: tron-pnw-prod.yaml
✓ Successfully validated schema: tron-pnw-devc.yaml
✓ Successfully validated schema: adhoc-pnw-prod.yaml
✓ Successfully validated schema: eks-pnw-prod.yaml
✓ Successfully validated schema: eks-pnw-devc.yaml
✓ Successfully validated schema: adhoc-pnw-devc.yaml
✓ Successfully validated schema: adhoc-pnw-prod-spark.yaml
✓ Successfully validated schema: adhoc-norcal-devc.yaml
✓ Successfully validated schema: service.yaml
✓ Successfully validated schema: kubernetes-pnw-prod.yaml
✓ Successfully validated schema: kubernetes-pnw-devc.yaml
✓ tron-pnw-prod.yaml is valid.
✓ tron-pnw-devc.yaml is valid.
✓ All PaaSTA Instances for are valid for all clusters
✓ All spark's instance names in cluster norcal-devc are unique
✓ All spark's instance names in cluster norcal-stagef are unique
✓ All spark's instance names in cluster pnw-devc are unique
✓ All spark's instance names in cluster pnw-prod are unique
✓ All spark's instance names in cluster pnw-prod-spark are unique
✓ No orphan secrets found

When flag is enabled

# should not launch
paasta spark-run --aws-profile=dev-cloud-economics --cmd "spark-submit /code/integration_tests/s3.py"
# output: https://fluffy.yelpcorp.com/i/qp6Q4200DsVGl3t9FKp7n2bMGt8l5mZ9.html

# should launch with labels attached to pods
paasta spark-run --aws-profile=dev-cloud-economics --jira-ticket=CLOUD-802 --cmd "spark-submit /code/integration_tests/s3.py"
# output:  https://fluffy.yelpcorp.com/i/N40kkpV06BqpXGvvPWNsFlcdwrFk5Pn3.html

# paasta validate works 
paasta validate -y ~/repos/yelpsoa-configs -s spark
✓ Successfully validated schema: tron-pnw-prod.yaml
✓ Successfully validated schema: tron-pnw-devc.yaml
✓ Successfully validated schema: adhoc-pnw-prod.yaml
✓ Successfully validated schema: eks-pnw-prod.yaml
✓ Successfully validated schema: eks-pnw-devc.yaml
✓ Successfully validated schema: adhoc-pnw-devc.yaml
✓ Successfully validated schema: adhoc-pnw-prod-spark.yaml
✓ Successfully validated schema: adhoc-norcal-devc.yaml
✓ Successfully validated schema: service.yaml
✓ Successfully validated schema: kubernetes-pnw-prod.yaml
✓ Successfully validated schema: kubernetes-pnw-devc.yaml
✓ tron-pnw-prod.yaml is valid.
✓ tron-pnw-devc.yaml is valid.
✓ All PaaSTA Instances for are valid for all clusters
✓ All spark's instance names in cluster norcal-devc are unique
✓ All spark's instance names in cluster norcal-stagef are unique
✓ All spark's instance names in cluster pnw-devc are unique
✓ All spark's instance names in cluster pnw-prod are unique
✓ All spark's instance names in cluster pnw-prod-spark are unique
✓ No orphan secrets found

[chi-yelp]

Looks good to me on the implementation side, will let @nemacysts to confirm the repo setup

[nemacysts]

(i'm just requesting changes since i want to make sure we don't merge this with the requirements/dependencies as-is)

[sidsatyelp]

@nemacysts Can you review these changes please?

[nemacysts]

would probably be nice to have a comment here about why this is being installed - but since this is temporary i won't be too picky :p

[sidsatyelp]

Added the comment.