feat(redhat-argocd): allow appNamespace and project params

[CryptoRodeo]

Hey, I just made a Pull Request!

Fixes #3983

Relies on #3989

:heavy_check_mark: Checklist

• [x] A changeset describing the change and affected packages. (more info)
• [x] Added or updated documentation
• [x] Tests for new functionality and regression tests for bug fixes
• [ ] Screenshots attached (for UI changes)
• [x] All your commits have a Signed-off-by line in the message. (more info)

[backstage-goalie[bot]]

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@backstage-community/plugin-redhat-argocd-backend	workspaces/redhat-argocd/plugins/argocd-backend	minor	v0.6.1
@backstage-community/plugin-redhat-argocd	workspaces/redhat-argocd/plugins/argocd	minor	v1.19.2

[CryptoRodeo]

@caugello PTAL