feat(synthetics): set runtime_type and runtime_type_version as required

[Aashirwadjain]

Description

This PR aims to set runtime_type and runtime_type_version schema attributes as required for synthetic monitors.

Fixes # (issue)

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

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• My commit message follows conventional commits
• My code is formatted to Go standards
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes. Go here for instructions on running tests locally.

[github-actions]

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97a8610 - feat(synthetics_monitor): add default values to runtime_type and runtime_type_version

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