Simplify public key logic

[abatallas]

Originally part of #123, this PR streamlines how we handle input of SSH public keys. Most notably, it removes the various instances of "foo" exposed to the user when they try to view deployment parameters in the Portal.

[Copilot]

Pull request overview

This PR streamlines SSH public key input by consolidating “entered vs stored” selection into a single key object passed from the Portal UI definition into the Bicep templates, removing placeholder (“foo”) values previously surfaced to users in deployment parameters.

Changes:

• Replaces autogeneratePasswordsAndKeys with publicKeySource in the Portal UI and outputs a unified key { type, value, id } object.
• Introduces a discriminated-union publicKey_t in Bicep and updates templates/modules to consume it.
• Simplifies the public key module interface to take only the stored key resource ID.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
uidefinitions/createUiDefinition.json	Renames and rewires UI inputs; emits consolidated key output object.
bicep/types.bicep	Adds publicKey_t discriminated union for entered/stored key variants.
bicep/publicKey.bicep	Updates module contract to accept a stored key resource ID and output the public key.
bicep/mainTemplate.bicep	Replaces separate SSH key params with unified key parameter passed to ccw.bicep.
bicep/ccw.bicep	Resolves the effective SSH public key from either stored key lookup or entered value.

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