fix: handleSwitchRouteSet builds timeline with stale studio routeSets

[Julusian]

About the Contributor

This pull request is posted on behalf of the BBC

Type of Contribution

This is a: Bug fix

New Behavior

This fixes a flaw in #1285

My testing showed that it was updating the timeline, and the routeset was toggling, but I didn't notice that the active value for the routeset was always one update behind.

This is because studioPlayoutModel.switchRouteSet would store the pending changes on the studioPlayoutModel. Then later when building the timeline, it was fetching the DBStudio off the context. Ignoring that there might be some changes performed earlier in the job that might want to be used.

This change changes this, so that the changes are instead stored inside the context. This means that after calling switchRouteSet any fetches of the studio from the context will reflect the updated but not yet saved values.

Testing

• I have added one or more unit tests for this PR
• I have updated the relevant unit tests
• No unit test changes are needed for this PR

Affected areas

Time Frame

Other Information

This also does some refactoring to split up a file. To make review easier, read each commit separately

Status

• PR is ready to be reviewed.
• The functionality has been tested by the author.
• Relevant unit tests has been added / updated.
• Relevant documentation (code comments, system documentation) has been added / updated.

[codecov]

Codecov Report

Attention: Patch coverage is 97.58065% with 3 lines in your changes missing coverage. Please review.

Project coverage is 60.71%. Comparing base (132ebc0) to head (082b1d8).
Report is 2 commits behind head on release52.

Files with missing lines	Patch %	Lines
...c/playout/model/implementation/PlayoutModelImpl.ts	50.00%	1 Missing ⚠️
...ob-worker/src/studio/model/StudioBaselineHelper.ts	0.00%	1 Missing ⚠️
...-worker/src/studio/model/StudioPlayoutModelImpl.ts	83.33%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           release52    #1291      +/-   ##
=============================================
+ Coverage      60.63%   60.71%   +0.08%     
=============================================
  Files            459      460       +1     
  Lines          78598    78634      +36     
  Branches        4961     4926      -35     
=============================================
+ Hits           47655    47746      +91     
- Misses         30729    30773      +44     
+ Partials         214      115      -99     

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