fix: Add error handling for provided runtime layer building

[mildaniel]

Which issue(s) does this change fix?

#5586

Why is this change necessary?

Don't crash SAM CLI if CompatibleRuntimes is none and explain the issue to users.

How does it address the issue?

Adds additional error handling to gracefully exit and provide failure details to users.

What side effects does this change have?

N/A

Mandatory Checklist

PRs will only be reviewed after checklist is complete

• Add input/output type hints to new functions/methods
• Write design document if needed (Do I need to write a design document?)
• Write/update unit tests
• Write/update integration tests
• Write/update functional tests if needed
• make pr passes
• make update-reproducible-reqs if dependencies were changed
• Write documentation

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[moelasmar]

it looks good to me, can you just update this class

aws-sam-cli/tests/integration/buildcmd/test_build_cmd.py

Line 1750 in 46c374f

class TestBuildCommand_LayerBuilds(BuildIntegBase):

, and add a new test case to testing makefile layers without CompatibleRuntimes