fix: remove default replicas value to support HPA scaling

[Fortune-Ndlovu]

Description

This PR emoves the replicas: 1 field from config/profile/rhdh/default-config/deployment.yaml.

This change allows users to apply Horizontal Pod Autoscalers (HPA) to the Backstage deployment without the operator reverting replica counts.

• Verified locally on Kind with metrics-server
• Confirmed HPA scales to 3 under CPU load
• Operator no longer resets to 1

You can view my entire replication of the issue and overall steps I took to ensure the fix works, in the issue comments section: https://issues.redhat.com/browse/RHIDP-7857

Which issue(s) does this PR fix or relate to

• Fixes https://issues.redhat.com/browse/RHIDP-7857

PR acceptance criteria

• Tests
• Documentation

How to test changes / Special notes to the reviewer

[github-actions]

⚠️ Files changed in bundle and installer generation!

Those changes to the operator bundle/installer manifests should have been pushed automatically to your PR branch.

NOTE: If the PR checks are stuck after this additional commit, manually close the PR and immediately reopen it to trigger the checks again.

[github-actions]

PR images are available:

1. https://quay.io/rhdh-community/operator:0.7.0-pr-1284-b7df885
2. https://quay.io/rhdh-community/operator-bundle:0.7.0-pr-1284-b7df885
3. https://quay.io/rhdh-community/operator-catalog:0.7.0-pr-1284-b7df885

[github-actions]

⚠️ Files changed in bundle and installer generation!

Those changes to the operator bundle/installer manifests should have been pushed automatically to your PR branch.

NOTE: If the PR checks are stuck after this additional commit, manually close the PR and immediately reopen it to trigger the checks again.

[github-actions]

PR images are available:

1. https://quay.io/rhdh-community/operator:0.7.0-pr-1284-f3c8a54
2. https://quay.io/rhdh-community/operator-bundle:0.7.0-pr-1284-f3c8a54
3. https://quay.io/rhdh-community/operator-catalog:0.7.0-pr-1284-f3c8a54

[github-actions]

⚠️ Files changed in bundle and installer generation!

Those changes to the operator bundle/installer manifests should have been pushed automatically to your PR branch.

NOTE: If the PR checks are stuck after this additional commit, manually close the PR and immediately reopen it to trigger the checks again.

[github-actions]

PR images are available:

1. https://quay.io/rhdh-community/operator:0.7.0-pr-1284-008bf77
2. https://quay.io/rhdh-community/operator-bundle:0.7.0-pr-1284-008bf77
3. https://quay.io/rhdh-community/operator-catalog:0.7.0-pr-1284-008bf77

[rm3l]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gazarenkov, rm3l

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