fix: add extra stack outputs and inputs

[akocbek]

Description

issues:

• https://github.com/terraform-ibm-modules/stack-retrieval-augmented-generation/issues/210
• https://github.com/terraform-ibm-modules/stack-retrieval-augmented-generation/issues/212

Release required?

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• [x] Patch release (x.x.X)
• [ ] Minor release (x.X.x)
• [ ] Major release (X.x.x)

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[akocbek]

/run pipeline

[akocbek]

/run pipeline

[akocbek]

/run pipeline

[akocbek]

/run pipeline

[akocbek]

/run pipeline

[ocofaigh]

@akocbek Can we try get this ready for merge?