feat: replace ALB with NLB

[ludwig-mueller]

Description

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Release notes content

• replace ALB with NLB
• Refactor: move NLB from separate module into one file in landing-zone for easier maintenance and better overview
• Introduce an implicit dependency between linux init and network services init, nlb, and nfs to speed up deployment time

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[ludwig-mueller]

/run pipeline

[surajsbharadwaj]

1. Missing last updated, version number and architecture decisions table need an update
2. Update powervs workspace module version if any
3. catalogValidationValues.json.template files across 2 solutions standard and Quickstart only must be updated to point to us-south location

[ludwig-mueller]

/run pipeline

[ludwig-mueller]

/run pipeline

[terraform-ibm-modules-ops]

🎉 This PR is included in version 8.6.0 🎉

The release is available on:

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• v8.6.0

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