Reduce aro hcp stg quota slice

[raelga]

What

Reduce aro-hcp-stg-quota-slice Boskos resource count from 5 to 1.

Why

The periodic-ci-Azure-ARO-HCP-main-periodic-stage-e2e-parallel job has a ~70% failure rate (14 failures out of 20 recent runs): https://prow.ci.openshift.org/job-history/gs/test-platform-results/logs/periodic-ci-Azure-ARO-HCP-main-periodic-stage-e2e-parallel

The staging environment has a quota of 300 public IP addresses and each HCP requires at least 9. With 5 concurrent quota slices, multiple e2e runs compete for the limited pool of public IPs, leading to resource exhaustion and cascading failures. Reducing to 1 slice serializes the runs, preventing concurrent access and quota contention.

Testing

• Regenerated boskos config with make boskos-config and verified the output.

Special notes for your reviewer

Source change and generated config are in separate commits for easier review.

[stevekuznetsov]

/lgtm
/approve
/pj-rehearse ack

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: raelga, stevekuznetsov
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[openshift-ci-robot]

[REHEARSALNOTIFIER]
@raelga: no rehearsable tests are affected by this change

Note: If this PR includes changes to step registry files (ci-operator/step-registry/) and you expected jobs to be found, try rebasing your PR onto the base branch. This helps pj-rehearse accurately detect changes when the base branch has moved forward.

[openshift-ci-robot]

[REHEARSALNOTIFIER]
@raelga: no rehearsable tests are affected by this change

Note: If this PR includes changes to step registry files (ci-operator/step-registry/) and you expected jobs to be found, try rebasing your PR onto the base branch. This helps pj-rehearse accurately detect changes when the base branch has moved forward.

Interacting with pj-rehearse

Comment: /pj-rehearse to run up to 5 rehearsals
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[openshift-ci]

@raelga: all tests passed!

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