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[bot]]

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[aliceliu]

• #10363 👈
• main

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #10363 +/- ## ======================================= Coverage 88.75% 88.75% ======================================= Files 180 180 Lines 22486 22487 +1 ======================================= + Hits 19957 19958 +1 Misses 2529 2529 ``` | [Flag](https://app.codecov.io/gh/dbt-labs/dbt-core/pull/10363/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dbt-labs) | Coverage Δ | | |---|---|---| | [integration](https://app.codecov.io/gh/dbt-labs/dbt-core/pull/10363/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dbt-labs) | `86.01% <100.00%> (+<0.01%)` | :arrow_up: | | [unit](https://app.codecov.io/gh/dbt-labs/dbt-core/pull/10363/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dbt-labs) | `62.19% <100.00%> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dbt-labs#carryforward-flags-in-the-pull-request-comment) to find out more. | [Components](https://app.codecov.io/gh/dbt-labs/dbt-core/pull/10363/components?src=pr&el=components&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dbt-labs) | Coverage Δ | | |---|---|---| | [Unit Tests](https://app.codecov.io/gh/dbt-labs/dbt-core/pull/10363/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dbt-labs) | `62.19% <100.00%> (+<0.01%)` | :arrow_up: | | [Integration Tests](https://app.codecov.io/gh/dbt-labs/dbt-core/pull/10363/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dbt-labs) | `86.01% <100.00%> (+<0.01%)` | :arrow_up: |