Add improved numbering for InstanceSpec and DefinitionSpec

[azidar]

Contributor Checklist

• [N/A] Did you add Scaladoc to every public function/method?
• [N/A] Did you add at least one test demonstrating the PR?
• [N/A] Did you delete any extraneous printlns/debugging code?
• Did you specify the type of improvement?
• [N/A] Did you add appropriate documentation in docs/src?
• Did you state the API impact?
• Did you specify the code generation impact?
• Did you request a desired merge strategy?

Type of Improvement

• code cleanup

API Impact

None

Backend Code Generation Impact

None

Reviewer Checklist (only modified by reviewer)

• Did you add the appropriate labels?
• Did you mark the proper milestone (Bug fix: 3.4.x, [small] API extension: 3.5.x, API modification or big change: 3.6.0)?
• Did you review?
• Did you check whether all relevant Contributor checkboxes have been checked?
• Did you mark as Please Merge?

[mwachs5]

we should so do this everywhere any time someone has to touch a test suite...