tests: enable rpm-based tests

[bfjelds]

🔍 Description

Enable trident tests to run from RPMs, base images, and containers generated from azurelinux builds (rather than building Trident, osmodifier, imagecustomizer, etc).

Changes

• Align trident.spec to azurelinux/SPECS/trident/trident.spec
• For most jobs in Trident pipelines, call repo checkout template and pass self|trident to it based on whether the template is invoked from a Trident-based pipeline or a pipeline from another repo.
• Create trident source directory parameter for templates that do not checkout trident themselves
• Enable usage of pre-built RPM-based artitfacts for Trident rpms
• For RPMs built from dev pipelines where signing does not occur, enable secure-boot to be disabled in Trident tests
• For pipelines based in other org/projects, create parameter to allow for differently named service connection for ACR access
• Create stage type for this rpm-based test: azl-validation
• Separate base image build id from rpm build id. This allows the rpms to be downloaded from the build (10+ minutes) and stored as a local artifact (30s download). Introduce '@' prefix for build ids to identify when to download a local artifact.

[bfjelds]

undo before merging

[bfjelds]

undo before merging