[WIP] ZSS startup script to use HA-overriden config for that HA instance

[Gautham-coder]

ZSS doesnt respect HA config.

Proposed changes

Start-up ZSS with new HA overriden merged yaml created by zwe internal start prepare and made available throught environment variable ZWE_PRIVATE_HA_INSTANCE_CONFIG

Since the haInstances value is no longer available the cookieName behavior will be modified.

This PR addresses Issue: #737

This PR depends upon the following PRs: zowe/zowe-install-packaging#4759

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Change in a documentation
• Refactor the code
• Chore, repository cleanup, updates the dependencies.
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

PR Checklist

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• If the changes in this PR are meant for the next release / mainline, this PR targets the "staging" branch.
• My code follows the style guidelines of this project (see: Contributing guideline)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• New and existing unit tests pass locally with my changes
• video or image is included if visual changes are made
• Relevant update to CHANGELOG.md
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works, or describe a test method below

Testing

yaml
components:
  zss:
    enabled: true
    port: 56709
    crossMemoryServerName: "ZWESISV3"
    agent:
      jwt:
        fallback: true
      64bit: true

haInstances:
  lpar1:
    hostname: "lpar1.company.com"
    sysname: ${{ zos.resolveSymbol('&SYSNAME') }}
    components:
      zss:
        port: 56729        # override for this instance
        crossMemoryServerName: "ZWESISV3"

./zwe start --config ../zowe.yaml --ha-instance lpar1

Before fix:

ZWES1035I ZSS Server settings: Address='0.0.0.0', port='56709', protocol='https'

After fix:

ZWES1035I ZSS Server settings: Address='0.0.0.0', port='56729', protocol='https'

Further comments

[sonarqubecloud]

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