A more flexible grouping mechanism for different repos

[huydhn]

We use grouped view extensively on HUD, but the logic to group jobs by their names is bind tightly to PyTorch https://github.com/pytorch/test-infra/blob/main/torchci/lib/JobClassifierUtil.ts. This leads to weird groups on other repos, for example, https://hud.pytorch.org/hud/pytorch/torchchat/main has an XLA group? and many pull jobs listed in the other section? We should figure out a way to either make the grouping logic configurable by repo or use better heuristic to logically group similar jobs together.