Make time spine model name a constant

[aliceliu]

resolves #

Problem

Solution

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• This PR includes type annotations for new and modified functions

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[aliceliu]

• Make time spine model name a constant #10363 👈
• main

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.75%. Comparing base (11ee2b9) to head (564df42).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10363   +/-   ##
=======================================
  Coverage   88.75%   88.75%           
=======================================
  Files         180      180           
  Lines       22486    22487    +1     
=======================================
+ Hits        19957    19958    +1     
  Misses       2529     2529           

Flag	Coverage Δ
integration	86.01% <100.00%> (+<0.01%)	⬆️
unit	62.19% <100.00%> (+<0.01%)	⬆️

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Components	Coverage Δ
Unit Tests	62.19% <100.00%> (+<0.01%)	⬆️
Integration Tests	86.01% <100.00%> (+<0.01%)	⬆️

[ChenyuLInx]

Thanks a bunch!