Embedding Projector: fix t-SNE control when switching projections #6287
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Motivation for features / changes
If projection is switched from t-SNE to UMAP, t-SNE doesn't pause and the framerate would crash (5fps on M1 pro)
If projection is switched from t-SNE to PCA/Custom, t-SNE is stopped, so user has to restart t-SNE when switching back.
Technical description of changes
Pause t-SNE when switching away, resume t-SNE when
Screenshots of UI changes
N/A
Detailed steps to verify changes work correctly (as executed by you)
toggle from t-SNE to any other panel and back to t-SNE will resume t-SNE immediately
Alternate designs / implementations considered