[patch] Remove prompts requesting RSL URL, RSL Org ID, and RSL token from aiservice-install

[PalVala]

Changes

• remove prompts for RSL URL, RSL Org ID, and RSL token from aiservice-install
• align CLI flow so these values are obtained from the AI config app response instead of manual interactive input
• update supporting validation, Tekton params/templates, and installation docs to reflect the new behavior

Reason

• The prompts were redundant during interactive aiservice-install because the required values already come from the AI config app response body.

Relevant PR

• https://github.ibm.com/maximoappsuite/ibm-aiservice/pull/420

Testing

• validated mas install
• validated mas aiservice-install
• successful PipelineRuns captured as evidence
• CLI evidence captured showing prompts no longer ask for:
  RSL URL
  RSL Org ID
  RSL token